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Doe Run/ SFCR rules
B-Mod Rules (top) Doe Run 2012
ANYTHING NOT COVERED BY THESE RULES IS ILLEGAL!!!!!!!
1. ROLL CAGE: Must consist of continuous hoops, minimum 1.50-inch O.D. tubing, with a minimum wall thickness of .095-inch for main cage, frame-mounted in at least six places, low carbon or mild steel recommended. Must consist of a configuration of front, rear and top hoops connected by tubing on sides or side hoops. Driver's head must not protrude outside cage with helmet on. Roll cage must be securely supported and braced with minimum one cross bar in top halo. Foot protection bar required. Main cage no further forward than rear of engine. All bars forward of cage must be lower than hood.
2. DOOR BARS: All drivers side door bars and uprights must be minimum 1.5-inch O.D. and .083-inch wall thickness. Minimum three driver side door bars, parallel to ground & perpendicular to driver, and welded to front and rear of roll cage, passenger side must have at least one cross door bar, horizontal or angled, minimum 1.25-inch O.D. & .083 inch wall thickness, and one top door bar, minimum 1.5 inch O.D. & .083 inch wall thickness, steel door plate 18 gauge or .049-inch minimum thickness, must be securely welded to outside of driver side door bars & cover area from top door bar to bottom door bar and from rear hoop down post to 5 inches in front of seat. MUST BE VISABLE FOR INSPECTION.
3. SAFETY: Rules apply at all times car is on track. Snell rated SA95 or SA2000 helmet are required. SFI approved full fire suit, gloves & shoes required. Recommended fire retardant head sock and underwear, head and neck restraints. Driver side window net required, & must be mounted so latch is at top front of window or arm restraints.
Minimum three - inch wide five - point safety belt assembly required. Must be mounted securely to roll cage, recommended to be no more than three year old. Kill switch required within easy reach of driver and must be clearly marked ‘OFF' and ‘ON'. A small
Fire extinguisher in drivers compartment is mandatory.
4. FRAME: OEM complete 1964 or newer, perimeter American rear-wheel drive passenger car frame only. No sports car frames. Frames must be full & complete, cannot be widened or narrowed, & must be able to support roll cage on both sides, except weight jack in original center line of spring tower allowed: frame may be cut a maximum 36 inches forward from center of rear housing: horns may be removed in front of steering box: front cross member may be notched and boxed for radiator and/or steering clearance:. Maximum seven inch wide opening in side of spring tower for spring removal. Maximum two inch wide by four inch tall frame stiffener may be welded directly to outside of left side frame rail. Minimum wheelbase is 108 inches, maximum is 112 inches, both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire. No part of frame can be lower than four inches from ground except front cross member.
5. BODY: Must be same width, front to rear, and parallel to OEM frames. Engine compartment must remain open (no side panels). Hood must be enclosed at rear, no panel in front of right door to engine compartment. No inner panels, No car covers. Must have front windshield and rear window support posts. Driver and passenger side windows must have at least 12-inch opening, measured at center of window, between lowest point at top of window, whether roof or roll cage, and highest point at bottom of window, whether interior or body. May use Lexan in sail panels, may use full windshield. Must be fiberglass or aluminum full size roof rounded in all directions. ( roof escape panel is allowed) plastic skirting allowed on bottom of doors and quarters. Outside of tires must be widest part of car. 5" spoilers allowed. Spoiler supports no more than 5" tall in rear, 2" tall in front, and 12" long.
6. DRIVER COMPARTMENT: Must have a minimum three windshield bars in front of driver. Lexan or aluminum cowl panel in front of driver can be no wider than cockpit and no farther back than steering wheel. Minimum .125-inch aluminum, or .060-inch steel, complete floor pan required. Aluminum high-back seat only and must be bolted in next to left side frame rail and ahead of rear tires. Bottom of seat can be no lower than bottom of frame rail. Driver must be sealed off from race track, driveline, engine, fuel cell, canisters and pumps. Accumulators cannot be mounted between driver & left-side door bars. No devices that would enable driver adjustment to alter wheelbase or for weight jacking while car is in competition. No mirrors or reflective sun visors.
7. FRONT SUSPENSION: All components must be steel, unaltered OEM, in OEM location and replaced by OEM parts, except tube type upper A-frames with or without aluminum/steel cross shaft & mounts can be moved. OEM replacement lower A-frames bushings only, no offset or bearing type. All lower A-frame mounts and bolt holes on frame must be in stock location. Lower A frame must be right & left & of same design; rubber, nylon, or steel lower A frame bushings, no offset or bearing type: welded or bolted shock mount on lower A frame. Lower A frame mounts & bolt holes on frame must be in OEM, location. OEM ball joints only. Sway bar must be unaltered OEM.
After market lower A-Frames are legal.
8. STEERING: All components must be steel, unaltered OEM, in OEM location. except outer tie rod end & adjustment sleeve may be replaced by a minimum .625-inch steel rod end and steel tube; spindles can be ground for brake caliper clearance only; spindles must be right & left, & of the same design; bolt on spindle savers allowed; steel steering shafts & knuckles only. Steering quickener, steering wheel & quick release may be aluminum. Cockpit steering may be modified, must be kept on left side. No rack & pinion.
9. SHOCKS: One steel non-adjustable unaltered shock per wheel. One additional shock allowed on rear suspension. No bumpers or stops, no threaded body, front coil over, air or remote reservoir shocks. Front half may be shielded.
10. SPRINGS: One steel, non progressive coil over spring and/or steel leaf spring per wheel only. One additional spring allowed on pull bar or lift bar, may be progressive. Any coil spring must be at least 4.5 inches O.D. No torsion bars or air bags.
11. REAR SUSPENSION: All components must be steel. No covers allowed. All trailing arms/link bars must be solid tubing. Rear of frames may be altered to accept leaf or coil springs. Steel coil over eliminators or steel/aluminum coil over kits allowed. Must conform to shock and spring rules. One mechanical traction bar (pull or lift bar not both).
12. REAR END: Any steel approved OEM passenger car or truck rear end allowed. Safety hubs (floater) allowed. All components must be steel, except lowering blocks, axle cap, and drive flange. Inspection hole in housing is required. Full steel spool, steel mini spool or welded rear ends only. Steel axles only. No quick change devices, or cambered rear ends. One piece drive flange only. No torque dividing differentials.
13. BUMPERS AND RUB RAILS: Steel only. Bumpers must be used both front and rear at all times and welded or mounted with minimum .375-inch bolts. Must be minimum 1.25-inch O.D. tubing, .065 wall thickness on front, .095 wall thickness on rear. Two-bar front bumpers must be mounted to frame-end to frame-end, no wider than width of material outside frame horns and with bottom loop parallel to ground. Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center. Rear bumper and nerf bars can be no wider than tires.
14. TIRES AND WHEELS: Hoosier IMCA G-60 (KK704) tires only. Grooving , siping and or grinding of tires is allowed. No re-caps. Aluminum or steel spacers only. May use I.M.C.A. approved bead lock, on right rear only. External, steel bead lock only and it cannot make wheel any narrower than 8 inches and no wider than 8.75 inches. Must use only steel bolts. One foam type or plastic mud cap allowed on right rear only. Rim-mounted bleeder valves allowed.
15. BRAKES: Must be steel approved OEM, operative four wheel, drum or disc. Must maintain OEM dimensions for Hubs/rotors and calipers, cannot be lightened. Bolt patter may be changed. Larger studs allowed. Rear rotors may be aftermarket, min. 0.810-inch thickness. Vented rotors only, no scalloped rotors. No brake shut-off or pressure sensitive devices. One proportioning device allowed, front to rear only. Brake lines must be visible.
16. EXHAUST: Round tube headers only. All primary header tubes must enter directly into one collector, at same point, at end of header. No exhaust sensors. Must run mufflers.
17. FUEL SYSTEM: Mechanical fuel pump only and must be mounted at front of engine. Racing fuel cell required, maximum 32-gallon capacity, must be in minimum 18-gauge steel container. Cell must be securely mounted behind rear axle, between rear tires, minimum of four inches ahead of bumper, minimum of ten inches above ground. Must mount with minimum two .125-inch thick solid steel straps, two inches wide around entire cell. All cell mounts must be steel, securely welded to frame/cage. Protective tubing must cover rear & extend past both sides of cell. No part of cell shall be lower than protective tubing. Fuel cell vents, including cap vent, must have check valves. Pick-up must be on top or right side of cell. Limit of one fuel filter. No cool cans. One naturally aspirated 2-barrel 500 cfm 13/8" venturi carburetor only. May remove choke horn.
18. FUEL: Must be Gasoline . NO performance-enhancing additives. Upper cylinder lube allowed. Fuel sample may be taken from any car at any time. Penalty for illegal fuel is disqualification from event and $250 fine - first offense. No Alcohol. E-85 allowed.
19. WEIGHT: Minimum weight limit of 2,600 pounds, no tolerance, after race with driver in car. No weights and/or loose objects in driver compartment or outside body. Weights must be securely mounted to frame or roll cage and painted white with car number on it. Must be attached with at least two .5-inch bolts. No titanium, magnesium. No gun-drilled, tubular, hollow bolts or studs.
20. BATTERY AND STARTER: One 12-volt battery only, must be shielded & securely mounted between frame rails. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided, or go to rear of that race. Reverse-mount starters with OEM case transmissions only.
21. GAUGES AND ELECTRONICS: No transmitting or listening devices, timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except along tach. No adjustable ignition control boxes. Only one 12-volt ignition box allowed, must be out of driver's reach. No additional ignition accessories allowed. Only change allowed to ignition box is one high-end rev-limiter setting. This setting can be changed through one chip only, or an internal setting inside box. No electronic traction control devices ($10,000 fine).
22. TRANSMISSION AND DRIVESHAFT: Must have at least two forward gears & one reverse, plus a neutral position. With engine running and car in still position, must be able to engage car in gear & move forward, then backward. OEM production type I.M.C.A. approved after-market transmissions allowed two speed, three speed, four speed and automatic. No five speed (or more) transmissions, in & out boxes, or quick change devices allowed. Functioning shift levers must be in OEM location on all OEM production type transmissions. Flex plates must be full steel, unaltered OEM or OEM replacement. Flywheel/flex plate
must bolt to engine between clutch assembly & crankshaft & all driving components
within bell housing must rotate while car is in any gear. Transmissions must be one of the following designs:
MANUAL: Must have a standard OEM case & working disc-type clutch or approved cone or disc type coupler inside an explosion proof steel bell housing. One fly wheel only, minimum 8.5 inches diameter. Diameter of clutch disc must be a minimum of 5.5 inches. Clutch assembly must be steel, except housing, which must be steel and/or aluminum. Bell housing can have only a hole for throw out bearing lever or hose, must be 270 degrees around top of clutch and flywheel area. Standard or reverse mount starter allowed, must directly engage flywheel. No internal clutch type transmissions. Except automatics.
AUTOMATIC: Must remain in OEM or OEM replacement case with a functioning OEM appearing pump. Must have an approved scatter shield. Scatter shield must be constructed of minimum of .125-inch by three-inch steel, 270 degrees around flex plate.
DRIVE SHAFT: Minimum two-inch diameter steel drive shaft & must be painted white. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least .25-inch by two-inch steel, or one-inch tubing, mounted six inches back from front U-joint.
23. ENGINE LOCATION: Rear of engine (bell housing flange) must be mounted at least 72 inches forward from the centerline of rear axle. Engines offset must be kept within 2 inches of centerline of front cross member with engine level. Minimum 11-inch engine height from ground to center of crankshaft. Radiator must be mounted in front of engine. Cooling system may be modified. Overflow tubes must be directed to ground between frame rails.
24. ENGINE SPECIFICAIONS: Any American made engine allowed. Steel heads, block & oil pan only. All engines must be able to be used in conventional passenger car without alterations. Engine mounts cannot be removed or altered. Castings and fittings must not be changed. Wet oiling system only. No Roller cams.
B-Mod Rules (top) Doe Run 2012
ANYTHING NOT COVERED BY THESE RULES IS ILLEGAL!!!!!!!
1. ROLL CAGE: Must consist of continuous hoops, minimum 1.50-inch O.D. tubing, with a minimum wall thickness of .095-inch for main cage, frame-mounted in at least six places, low carbon or mild steel recommended. Must consist of a configuration of front, rear and top hoops connected by tubing on sides or side hoops. Driver's head must not protrude outside cage with helmet on. Roll cage must be securely supported and braced with minimum one cross bar in top halo. Foot protection bar required. Main cage no further forward than rear of engine. All bars forward of cage must be lower than hood.
2. DOOR BARS: All drivers side door bars and uprights must be minimum 1.5-inch O.D. and .083-inch wall thickness. Minimum three driver side door bars, parallel to ground & perpendicular to driver, and welded to front and rear of roll cage, passenger side must have at least one cross door bar, horizontal or angled, minimum 1.25-inch O.D. & .083 inch wall thickness, and one top door bar, minimum 1.5 inch O.D. & .083 inch wall thickness, steel door plate 18 gauge or .049-inch minimum thickness, must be securely welded to outside of driver side door bars & cover area from top door bar to bottom door bar and from rear hoop down post to 5 inches in front of seat. MUST BE VISABLE FOR INSPECTION.
3. SAFETY: Rules apply at all times car is on track. Snell rated SA95 or SA2000 helmet are required. SFI approved full fire suit, gloves & shoes required. Recommended fire retardant head sock and underwear, head and neck restraints. Driver side window net required, & must be mounted so latch is at top front of window or arm restraints.
Minimum three - inch wide five - point safety belt assembly required. Must be mounted securely to roll cage, recommended to be no more than three year old. Kill switch required within easy reach of driver and must be clearly marked ‘OFF' and ‘ON'. A small
Fire extinguisher in drivers compartment is mandatory.
4. FRAME: OEM complete 1964 or newer, perimeter American rear-wheel drive passenger car frame only. No sports car frames. Frames must be full & complete, cannot be widened or narrowed, & must be able to support roll cage on both sides, except weight jack in original center line of spring tower allowed: frame may be cut a maximum 36 inches forward from center of rear housing: horns may be removed in front of steering box: front cross member may be notched and boxed for radiator and/or steering clearance:. Maximum seven inch wide opening in side of spring tower for spring removal. Maximum two inch wide by four inch tall frame stiffener may be welded directly to outside of left side frame rail. Minimum wheelbase is 108 inches, maximum is 112 inches, both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire. No part of frame can be lower than four inches from ground except front cross member.
5. BODY: Must be same width, front to rear, and parallel to OEM frames. Engine compartment must remain open (no side panels). Hood must be enclosed at rear, no panel in front of right door to engine compartment. No inner panels, No car covers. Must have front windshield and rear window support posts. Driver and passenger side windows must have at least 12-inch opening, measured at center of window, between lowest point at top of window, whether roof or roll cage, and highest point at bottom of window, whether interior or body. May use Lexan in sail panels, may use full windshield. Must be fiberglass or aluminum full size roof rounded in all directions. ( roof escape panel is allowed) plastic skirting allowed on bottom of doors and quarters. Outside of tires must be widest part of car. 5" spoilers allowed. Spoiler supports no more than 5" tall in rear, 2" tall in front, and 12" long.
6. DRIVER COMPARTMENT: Must have a minimum three windshield bars in front of driver. Lexan or aluminum cowl panel in front of driver can be no wider than cockpit and no farther back than steering wheel. Minimum .125-inch aluminum, or .060-inch steel, complete floor pan required. Aluminum high-back seat only and must be bolted in next to left side frame rail and ahead of rear tires. Bottom of seat can be no lower than bottom of frame rail. Driver must be sealed off from race track, driveline, engine, fuel cell, canisters and pumps. Accumulators cannot be mounted between driver & left-side door bars. No devices that would enable driver adjustment to alter wheelbase or for weight jacking while car is in competition. No mirrors or reflective sun visors.
7. FRONT SUSPENSION: All components must be steel, unaltered OEM, in OEM location and replaced by OEM parts, except tube type upper A-frames with or without aluminum/steel cross shaft & mounts can be moved. OEM replacement lower A-frames bushings only, no offset or bearing type. All lower A-frame mounts and bolt holes on frame must be in stock location. Lower A frame must be right & left & of same design; rubber, nylon, or steel lower A frame bushings, no offset or bearing type: welded or bolted shock mount on lower A frame. Lower A frame mounts & bolt holes on frame must be in OEM, location. OEM ball joints only. Sway bar must be unaltered OEM.
After market lower A-Frames are legal.
8. STEERING: All components must be steel, unaltered OEM, in OEM location. except outer tie rod end & adjustment sleeve may be replaced by a minimum .625-inch steel rod end and steel tube; spindles can be ground for brake caliper clearance only; spindles must be right & left, & of the same design; bolt on spindle savers allowed; steel steering shafts & knuckles only. Steering quickener, steering wheel & quick release may be aluminum. Cockpit steering may be modified, must be kept on left side. No rack & pinion.
9. SHOCKS: One steel non-adjustable unaltered shock per wheel. One additional shock allowed on rear suspension. No bumpers or stops, no threaded body, front coil over, air or remote reservoir shocks. Front half may be shielded.
10. SPRINGS: One steel, non progressive coil over spring and/or steel leaf spring per wheel only. One additional spring allowed on pull bar or lift bar, may be progressive. Any coil spring must be at least 4.5 inches O.D. No torsion bars or air bags.
11. REAR SUSPENSION: All components must be steel. No covers allowed. All trailing arms/link bars must be solid tubing. Rear of frames may be altered to accept leaf or coil springs. Steel coil over eliminators or steel/aluminum coil over kits allowed. Must conform to shock and spring rules. One mechanical traction bar (pull or lift bar not both).
12. REAR END: Any steel approved OEM passenger car or truck rear end allowed. Safety hubs (floater) allowed. All components must be steel, except lowering blocks, axle cap, and drive flange. Inspection hole in housing is required. Full steel spool, steel mini spool or welded rear ends only. Steel axles only. No quick change devices, or cambered rear ends. One piece drive flange only. No torque dividing differentials.
13. BUMPERS AND RUB RAILS: Steel only. Bumpers must be used both front and rear at all times and welded or mounted with minimum .375-inch bolts. Must be minimum 1.25-inch O.D. tubing, .065 wall thickness on front, .095 wall thickness on rear. Two-bar front bumpers must be mounted to frame-end to frame-end, no wider than width of material outside frame horns and with bottom loop parallel to ground. Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center. Rear bumper and nerf bars can be no wider than tires.
14. TIRES AND WHEELS: Hoosier IMCA G-60 (KK704) tires only. Grooving , siping and or grinding of tires is allowed. No re-caps. Aluminum or steel spacers only. May use I.M.C.A. approved bead lock, on right rear only. External, steel bead lock only and it cannot make wheel any narrower than 8 inches and no wider than 8.75 inches. Must use only steel bolts. One foam type or plastic mud cap allowed on right rear only. Rim-mounted bleeder valves allowed.
15. BRAKES: Must be steel approved OEM, operative four wheel, drum or disc. Must maintain OEM dimensions for Hubs/rotors and calipers, cannot be lightened. Bolt patter may be changed. Larger studs allowed. Rear rotors may be aftermarket, min. 0.810-inch thickness. Vented rotors only, no scalloped rotors. No brake shut-off or pressure sensitive devices. One proportioning device allowed, front to rear only. Brake lines must be visible.
16. EXHAUST: Round tube headers only. All primary header tubes must enter directly into one collector, at same point, at end of header. No exhaust sensors. Must run mufflers.
17. FUEL SYSTEM: Mechanical fuel pump only and must be mounted at front of engine. Racing fuel cell required, maximum 32-gallon capacity, must be in minimum 18-gauge steel container. Cell must be securely mounted behind rear axle, between rear tires, minimum of four inches ahead of bumper, minimum of ten inches above ground. Must mount with minimum two .125-inch thick solid steel straps, two inches wide around entire cell. All cell mounts must be steel, securely welded to frame/cage. Protective tubing must cover rear & extend past both sides of cell. No part of cell shall be lower than protective tubing. Fuel cell vents, including cap vent, must have check valves. Pick-up must be on top or right side of cell. Limit of one fuel filter. No cool cans. One naturally aspirated 2-barrel 500 cfm 13/8" venturi carburetor only. May remove choke horn.
18. FUEL: Must be Gasoline . NO performance-enhancing additives. Upper cylinder lube allowed. Fuel sample may be taken from any car at any time. Penalty for illegal fuel is disqualification from event and $250 fine - first offense. No Alcohol. E-85 allowed.
19. WEIGHT: Minimum weight limit of 2,600 pounds, no tolerance, after race with driver in car. No weights and/or loose objects in driver compartment or outside body. Weights must be securely mounted to frame or roll cage and painted white with car number on it. Must be attached with at least two .5-inch bolts. No titanium, magnesium. No gun-drilled, tubular, hollow bolts or studs.
20. BATTERY AND STARTER: One 12-volt battery only, must be shielded & securely mounted between frame rails. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided, or go to rear of that race. Reverse-mount starters with OEM case transmissions only.
21. GAUGES AND ELECTRONICS: No transmitting or listening devices, timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except along tach. No adjustable ignition control boxes. Only one 12-volt ignition box allowed, must be out of driver's reach. No additional ignition accessories allowed. Only change allowed to ignition box is one high-end rev-limiter setting. This setting can be changed through one chip only, or an internal setting inside box. No electronic traction control devices ($10,000 fine).
22. TRANSMISSION AND DRIVESHAFT: Must have at least two forward gears & one reverse, plus a neutral position. With engine running and car in still position, must be able to engage car in gear & move forward, then backward. OEM production type I.M.C.A. approved after-market transmissions allowed two speed, three speed, four speed and automatic. No five speed (or more) transmissions, in & out boxes, or quick change devices allowed. Functioning shift levers must be in OEM location on all OEM production type transmissions. Flex plates must be full steel, unaltered OEM or OEM replacement. Flywheel/flex plate
must bolt to engine between clutch assembly & crankshaft & all driving components
within bell housing must rotate while car is in any gear. Transmissions must be one of the following designs:
MANUAL: Must have a standard OEM case & working disc-type clutch or approved cone or disc type coupler inside an explosion proof steel bell housing. One fly wheel only, minimum 8.5 inches diameter. Diameter of clutch disc must be a minimum of 5.5 inches. Clutch assembly must be steel, except housing, which must be steel and/or aluminum. Bell housing can have only a hole for throw out bearing lever or hose, must be 270 degrees around top of clutch and flywheel area. Standard or reverse mount starter allowed, must directly engage flywheel. No internal clutch type transmissions. Except automatics.
AUTOMATIC: Must remain in OEM or OEM replacement case with a functioning OEM appearing pump. Must have an approved scatter shield. Scatter shield must be constructed of minimum of .125-inch by three-inch steel, 270 degrees around flex plate.
DRIVE SHAFT: Minimum two-inch diameter steel drive shaft & must be painted white. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least .25-inch by two-inch steel, or one-inch tubing, mounted six inches back from front U-joint.
23. ENGINE LOCATION: Rear of engine (bell housing flange) must be mounted at least 72 inches forward from the centerline of rear axle. Engines offset must be kept within 2 inches of centerline of front cross member with engine level. Minimum 11-inch engine height from ground to center of crankshaft. Radiator must be mounted in front of engine. Cooling system may be modified. Overflow tubes must be directed to ground between frame rails.
24. ENGINE SPECIFICAIONS: Any American made engine allowed. Steel heads, block & oil pan only. All engines must be able to be used in conventional passenger car without alterations. Engine mounts cannot be removed or altered. Castings and fittings must not be changed. Wet oiling system only. No Roller cams.
I assume they are the same as SFCR.. SFCR doesnt publish them on their website.. It says to go to Dons Radiator or get them at pill draw. I dont care at all for these rules.. Why? They are not affordable!! They are an Amod with a2bbl. Not an affordable modified class..
Heres another to look at..
(Southern UMP Modified, East Coast UMP Modified, Western UMP Modified, Limited UMP Modified)
v Under the guideline of the 2012 DIRTcar UMP Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules applies to all divisions, except in instances where any local track rules, pertaining to any item are listed in the local track rules, whether that is in the technical components and/or the racing procedures and/or overall rules that are administered by the local track officials and management. In those instances and where applicable, the local track rules shall prevail.
v The 2012 DIRTcar UMP Modified Rules have been established to include the rules in several different regions ofNorth America, refer to the rules that are in effect in your region.
v The following are the 2012 UMP Modified rules. All amendments supersede any previous rules regarding any technical article and/or aspect.
v Under the guideline of the 2012 UMP Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules apply to all sanctioned divisions.
v The specifications published shall be considered a section of the “Official Rules and Specifications” for all events, series and sanctions by World Racing Group. All sections should be considered when determining specifications and governance.
Midwest Limited UMP Modified
15.0 Rule Addendums
15.1.C. Only Steel Cylinder Heads and Steel Blocks will be permitted.
15.1.I. Only a single 500 CFM Holley 2 Barrel carburetor will be permitted.
15.1.M Only Flat Tappet Cams will be permitted.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,400 lbs.
15.4.F The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier A-40 compound in the DIRTcar plated tire 26.5/8.0/15 or 27.5/8.0/15. The maximum width of the tire will be 9” inches.
UMP Limited Modified
15.0 Rule Addendums
15.1.A Only the GM 602 Crate Motor will be permitted for competition.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier A-40 compound in the DIRTcar plated tire 26.5/8.0/15 or 27.5/8.0/15. The maximum width of the tire will be 9” inches.
Deep South UMP Modified
15.0 Rule Addendums
15.1.C. Only Steel Cylinder Heads and Steel Blocks will be permitted.
15.1.I. Only a single 500 CFM Holley 2 Barrel carburetor will be permitted.
15.1.M Only Flat Tappet Cams will be permitted.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,600 lbs.
15.4.F The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier E-Mod “B” compound in the DIRTcar plated tire 26.0/8.0/15 or 26.5/8.0/15. The maximum width of the tire will be 9” inches.
Western UMP Modified (Barnett)
15.0 Rule Addendums
15.1.C Only Steel Cylinder Heads and Steel Blocks will be permitted.
15.1.H The exhaust system(s) must be mounted with the exhaust directed away from the vehicle and/or away from the ground (preferably horizontal and outside the body of the car). A maximum of 1/2” inch clearance surrounding the header pipe when directed through the firewall on the driver’s side. Local track rules will prevail when decibel and/or muffler rules.
The following mufflers are recommended for competition in All Western Region Events;
Extreme Technologies – P/N 21435; P/N 35835
15.1.I. Only a single 500 CFM Holley 2 Barrel carburetor will be permitted.
15.1.M Only Flat Tappet Cams will be permitted.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,600 lbs.
15.4.F The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier E-Mod “B” compound in the DIRTcar plated tire 26.0/8.0/15 or 26.5/8.0/15. The maximum width of the tire will be 9” inches.
DIRTcar Pro Modified Rules:
2012 Pro Modified Rules
TO ALL COMPETITORS/PARTICIPANTS
Under the guideline of the 2012 DIRTcar Pro Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules applies to all divisions, except in instances where any local track rules, pertaining to any item are listed in the local track rules, whether that is in the technical components and/or the racing procedures and/or overall rules that are administered by the local track officials and management. In those instances and where applicable, the local track rules shall prevail.
The 2012 DIRTcar Pro Modified Rules have been established to include the rules in several different regions ofNorth America, refer to the rules that are in effect in your region.
The following are the 2012 Pro Modified rules. All amendments supersede any previous rules regarding any technical article and/or aspect.
Under the guideline of the 2012 Pro Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules apply to all sanctioned divisions.
The specifications published shall be considered a section of the “Official Rules and Specifications” for all events, series and sanctions by World Racing Group. All sections should be considered when determining specifications and governance.
15.0 UMP Modifieds
ANY CAR, TEAM AND/OR DRIVER THAT DOES NOT MEET THESE SPECIFICATIONS AND/OR EQUIPMENT REQUIREMENTS WILL BE SUBJECT TO PENALTIES AS DETERMINED BY THE DIRTcar and/or World Racing Group OFFICIALS
15.1 – Engine
A.) Any American cast iron and/or steel made engine(s) will be permitted as long as the rear of the engine bell housing flange is mounted at least 72”-inches forward from the center of the rear axle. The engine offset must remain within two (2”) inches of the center line from the cross member. The minimum engine height when measured from the ground to the center of the crankshaft is 11” inches.
B.) All engines used in competition must be able to be used in a conventional passenger car without alteration. Alteration of motor mounts will not be permitted. Alteration of the castings and/or fittings will not be permitted. Any machine work on the outside of the engine or machine work on the front or rear of the crankshaft will not be permitted.
C.) Steel and/or cast iron Aftermarket and OEM performance engine blocks will be permitted.
D.) Only flat tappet cam, lifter and stud mounted rocker arms will be permitted. Mushroom and/or mushroom type lifters will not be permitted. Stud girdles will not be permitted.
E.) Steel and aluminum cylinder heads will be permitted. Any engine with aluminum cylinder heads must add an additional 50 lbs in front of the engine plate.
F.) Only magnetic steel oil pans will be permitted.
G.) Aluminum blocks will not be permitted.
H.) Crank triggers and Magnetos will not be permitted.
I.) Wet sump oiling systems must be operative and will go with a claim by DIRTcar officials. Overall dry sump systems will not be permitted.
J.) Alteration to the cooling system will be permitted. If alterations to the cooling system are made the stock-appearing hood line must be maintained.
K.) The battery must be securely mounted and shielded. The battery must not be mounted inside the driver’s cockpit.
L.) The exhaust system(s) must be mounted with the exhaust directed away from the vehicle and/or away from the ground (preferably horizontal and outside the body of the car). A maximum of 1/2” inch clearance surrounding the header pipe when directed through the firewall on the driver’s side. Local track rules will prevail when decibel and/or muffler rules.
M.) One two or four barrel carburetor is required.
N.) The engine must be a normally aspirated configuration.
O.) Fuel injection systems or electric fuel pumps will not be permitted.
P.) The GM Performance 602 ‘Crate’ Engine will be permitted for competition, provided they are sealed and meet all DIRTcar Crate Engine stock specifications.
Q.) There may be specific engine rules issued for each region ofNorth Americathat deviate from the standard UMP Modified Engine rules included herein.
15.1.1 Engine Claims
A.) Any qualified UMP Modified competitor has the right to claim any engine at any time during an UMP Modified event. To begin the claim a $750.00 fee, plus the agreement to an engine exchange in addition to $50.00 for the tow truck operator. All claims do not include: flywheel, clutch, pressure plate, bell housing, headers, carburetor, starter, fan & pulleys, motor mount, sending units and switches for oil pressure and water temperature, carburetor adaptor, clutch ball, clutch arm, throw out bearings, dip stick, water pump, distributor, plug wires or fuel pump.
B.) Any competitor who processes a claim must have taken the checkered flag in the feature race and have finished the feature race on the ‘lead lap’. The claim must be presented in cash or certified check to promoter or designated DIRTcar official within five (5) minutes after the completion of the feature race. The driver must have the claim payment and his/her DIRTcar current/valid membership and claim card available. A third party cannot provide these items to the claiming driver. (Yearly membership runs from January 1 through December 31.) All claims, positive or negative, must be reported immediately to DIRTcar headquarters by the event promoter and/or chief steward of the event. Drivers will only have the ability to make two (2) claims in any UMP Modified season. A driver can claim another driver’s engine only once during the year. Only the engine of the event winner can be claimed. In case of multiple claims on the same engine, the engine will go to a qualified driver who finished the furthest back in the field on the lead lap. Drivers may not claim an engine if he/she has spun out and caused a caution period. If a claim is refused, the claim is not held against the claiming driver. The claim rule is intended to maintain cost effectiveness and a level playing field in the UMP Modified division.
C.) Any driver making a claim must drive his/her car immediately after the finish of the feature, under its own power, directly to the claiming area. Only drivers and officials will be permitted in the claim area. The claim area must be designated by the promoter to all drivers at the driver’s meeting prior to the feature event. The feature winner must go to the claim area immediately following the finish of the feature event. If no driver comes immediately to the claiming area, the winner may proceed as directed.
D.) The claimed engine must be completely removed within one (1) hour from the time the claim is made.
E.) The first sell/no sell or trade of the engine by the driver being claimed is considered binding.
F.) Only a qualified driver may claim an engine and only the winning driver may agree to sell.
G.) Any refusal to sell forfeits all cash, trophies and contingency winnings for the feature as well as all DIRTcar State and Nationals points’ award for that night. Any driver refusing to sell his/her engine the first time is fined $200.00 and is suspended for the next racing event at their home track and one (1) week from all DIRTcar sanctioned race tracks. The second infraction for a driver refusing to sell their engine is a $600.00 fine and a suspension from all DIRTcar sanctioned tracks for 30-days.
H.) All claimed engines must be removed from the car at the track. The buyer must examine the engine before removal. Once removal has started, the sale is final. Any sabotage to claim an engine will result in the saboteur being suspended from all DIRTcar races for 30-days and until the fine of $1,000.00 is paid to DIRTcar.
I.) To claim an engine, the claiming driver must have raced at least one-half of the sanctioned events at the sanctioned track where the claim is made or at a minimum the three (3) most recent consecutive feature events at that track. A driver can have his/her engine claimed at any time. No claim can be made against a driver on his/her first night at a sanctioned track.
15.2 Transmission & Driveline
A.) The drive shaft must be made from magnetic steel. The driveshaft must be painted white with the car number clearly labeled on the drive shaft.
B.) Aluminum, fiberglass, or carbon fiber drive shafts will not be permitted.
C.) A 1/2”-ince x 2”-inch 18-gauge steel drive shaft hoop is mandatory. The drive shaft hoop must be at least six (6”) inches behind the universal-joint. Two hoops are strongly recommended.
D.) All competitors are encouraged to perform systematic checks on their drive-train.
E.) Direct drives and/or any type devices will not be permitted.
F.) The transmission must be bolted to the engine. All cars must have forward and working reverse gears and be able to shift to forward or reverse with engine running. BERT-type transmissions will be permitted.
G.) Clutch-type transmissions must be equipped with explosion-proof steel bell housing. In lieu of an explosion-proof bell housing or if one is not available for your engine, a shield of at least 1/2”-inch x 6”-inches covering the clutch area 360 degrees securely fastened in place and fabricated from magnetic steel will be permitted.
H.) The steering box must be O.E.M. Any-type rack and pinion style steering will not be permitted. The original bolt pattern that matches frame type must be used. In the cockpit, steering may be modified to suit the driver but must remain on the left side of the vehicle. Moving the steering mechanisms to the center of the vehicle will not be permitted.
15.3 Chassis/Frame
A.) Only factory production full 1950 or newer parallel American passenger car frames will be permitted. The frame must be complete in front of firewall. Cutting of the frame in any way in front of firewall will not be permitted.
B.) The frame must remain unaltered and must meet the requirements of the attached drawing.
C.) The right side frame rail may not be altered and/or raised and/or moved from the stock OEM location in any manner and must measure a maximum of six (6) inches from the ground to the bottom or lowest edge of the frame rail.
D.) The front cross member may be notched to allow clearance for the radiator only. The cross members must be plated to retain complete box configuration.
E.) Jeep, Bronco, 4-wheel drive, front wheel drive or sports car frames will not be permitted.
F.) The minimum wheelbase permitted will be 108” inches. The maximum wheelbase permitted will be 112” inches.
G.) The rear of the frame may be altered to accept leaf or coil springs. Any coil spring must be a minimum of 4-1/2” diameter.
H.) Fiberglass lift bars and/or rear torsion bars will not be permitted.
I.) Any frame may not be widened or narrowed and must be able to support the roll cage on both sides and must be full and complete on both sides.
J.) The minimum frame and body height from ground is four (4) inches.
K.) The front bumper must be mounted to the ends of the frame with the bottom loop parallel to the ground.
L.) A minimum of 1” diameter tubing and/or pipe is required to for towing of the vehicle.
M.) The rear bumpers must be constructed of tubing and/or flat stock. The rear bumpers must protect the fuel cell.
N.) The bumper(s) (front and rear) when measure from their center(s) must have a minimum of 25” inches of ground clearance. There will be a two (2) inch tolerance, plus or minus regarding this dimension. The rear bumper and/or the nerf bars must not extend beyond the width of rear tires. All bumpers must have round edges. Sharp edges on any bumper and/or bumper surface will not be permitted.
O.) The brace bars forward of the roll cage must not extend higher than stock hood height.
P.) The rear push bars must not extend beyond six (6”) inches of the rear quarter panel(s).
Q.) All side bars and bumpers must be capped on ends.
R.) The maximum overall width of the car, front and/or rear, shall not exceed 78” inches when measured from the outside of the tire tread on both sides of the vehicle. A maximum one (1”) inch spacer between the hub and wheel will be permitted. Steel and/or aluminum spacers will be permitted, provided the overall width of the vehicle does not exceed 78”-inches.
15.4 Weight
A.) All added weight(s) must be painted white with the car number clearly labeled on each weight.
B.) All added weight(s) must be securely mounted to car with minimum of two (2) 1/2”-inch bolts that pass completely through each weight and the car. Weights that are mounted on the rear bumper or outside the body of the car will not be permitted. All added weight must be mounted below all windows and the interior sheet metal.
C.) Any car that loses any weight(s) during any event may be fined up to $500.00.
D.) The minimum weight of car with driver at all times including after the race is 2,400 lbs. The minimum weight for a car with aluminum cylinder heads after the race will be 2,450 lbs.
E.) The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2250 lbs.
F.) The 604 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
F.) All weight determinations will be measured on the scales selected by the local track officials and/or by DIRTcar Officials for each racing event. There will be no weight tolerance after the completion of any racing event.
15.5 Fuel Cells and Fuel
A.) All cars must have fuel cells. The maximum capacity for the fuel cell will be 32 gallons. The fuel cell must be completely enclosed in an 18-gauge magnetic steel container. Aluminum fuel cell containers will not be permitted. All fuel cells must be completely visible. All fuel cells must have a minimum of 2”x2” inch x 1/8”-inch steel straps surrounding them. The fuel cell must be protected in the rear of axle by securely-mounted (welded) roll cage tubing.
B.) Any driver competing with a fuel cell that has a capacity greater than 32-gallons will lose all winnings and points for that event and fined $1,000.00.
C.) Any driver must be prepared to drain fuel upon request for measurement of the fuel cell.
D.) The fuel cell must not extend lower than protective tubing.
E.) Racing gasoline or alcohol will be permitted.
F.) Nitrous oxide, nitrous methane, propylene oxide or any type of additives will not be permitted.
G.) Fuel may be inspected at any time during any event.
H.) All fuel cells must have check valve in breather and filler check valve.
15.6 – Body
(See drawing diagram for reference – There may be dimensions referenced in the drawing diagram that are not referenced in written rules and vice versa. All dimensions whether written and/or referenced in the drawing diagram dimensional are rule(s),)
A.) All bodies must follow dimension(s) and the appearance as shown in diagram. The body shall be the fabricated modified body from approved vendors.
B.) The front windshield and rear window support must be stock appearing. The front window support(s) may have a clear Lexan support of no more than 16” inches including the roof post at the bottom and going straight to the roof. The support must be securely fastened in a positive manner.
C.) The front roof post must be in a straight line from top to bottom.
D.) The sides of the engine compartment will remain open. Any side panels in the engine compartment area will not be permitted. A five (5”) inch drop on either side of the hood will be permitted and it must enclosed at the rear of the hood. The firewall on driver’s side must meet the front of the door.
E.) The top of the doors must remain in line with the rear engine plate. The bottom of the doors may extend a maximum of eight (8”) inches past the motor plate toward the front of the vehicle.
F.) The side fins and/or flanges of any kind along the length of the entire car (hood, front – nose and/or roof) will not be permitted.
G.) The bodies should extend no further forward than the back of the block.
H.) A maximum of one (1) stone deflector, for rear mounted oil pumps, oil filters, and for the main oil tank will be permitted. The deflector may be made of steel, aluminum, or heavy gauge wire. The cover may only be mounted near the unit it is designed to protect with a maximum size of eighteen (18”x18”) inches square and mounted only from the upper right frame rail to the lower right frame rail.
I.) The minimum roof height is 42” inches with a maximum height of 52” inches.
J.) The minimum deck height is 28” inches with a maximum height of 38” inches.
K.) All cars must have a car number on both sides and the roof that are at least 18” inches in height and 14” inches in width.
L.) The driver’s last name must be displayed under the car number in a legible font that is a minimum of eight (8”) inch high letters.
M.) There must be a minimum of two (2”) inches of tire clearance from the body.
N.) The minimum ground clearance will be four (4”) inches.
O.) The measurement from center of the hub to the rear top of deck will be a minimum of 34” inches and a maximum of 48” inches.
P.) The maximum body width at the body’s widest part will be 68” inches. The minimum of width at the body’s narrowest part will be 53” inches. The bottom of the doors may have a maximum width of 68” inches.
Q.) On the left side the rear of the door may flare out six (6”) inches for tire clearance.
R.) The bottom of the flare must be curved and rounded not pointed in any fashion.
S.) The maximum rear width of car must be 67” inches at the widest point.
T.) The maximum roof width will be 50” inches with a minimum of 44” inches.
U.) The maximum roof length will be 56” inches with a minimum roof length of 41” inches.
V.) The maximum height on rear roof post vertical is 5” inches.
W.) The nose piece shall not be longer or wider than frame horns and shall not attached any further back than the radiator. The nose piece must not extend past the leading edge of the front bumper. The nose piece must have a minimum of six (6”) inches from the ground to the bottom edge of the nose piece.
X.) The spoiler shall be a maximum of 5” inches tall. Any spoiler angle will be permitted. Three (3) spoiler supports may be used; this includes side spoilers. The spoiler supports and side spoilers shall be 5” inches tall in the back and 2” inches tall in the front with a maximum total length of 12” inches at the bottom.
Y.) The spoiler may be fabricated from lexan or aluminum. You may use the roof post/spoiler kit. The kit has the roof post and spoiler fabricated in one piece. If the kit is utilized the spoiler height must remain 5” inches.
15.6.1 – Interior and Driver Compartment
A.) All windows must have a minimum 11”-inch vertical opening. The entire interior must have 11”-inches of clearance from the interior deck to the roof and all sections of the roll cage. *** – For 2012 it is highly recommended and mandatory in 2012; The minimum window opening will be 12”inches. The interior deck sheet metal to the right side of the driver must be fabricated on an angle from the driveshaft tunnel to the right side window to promote ease of exit for the driver through the right side and or front window opening.
B.) A master ignition switch within easy reach of the driver is mandatory. The switch must be clearly labeled “ON” and “OFF”.
C.) Hydraulic and/or pneumatic weight jacks, trackers, or similar adjustable components of any type will not be permitted.
D.) Mirrors of any type will not be permitted.
E.) The rock guard should end at a point perpendicular to the steering wheel.
F.) The drivers compartment must be sealed from the engine and the race track. The rear bubble of the hood should be closed and sealed from the driver.
G.) The maximum slope/rake of the interior sheet metal “shelf” front-to-rear is 4”-inches. The interior sheet metal must remain flat and level from side-to-side.
H.) The top of the interior must be flush with the top of door and quarter panels.
15.6.2 – Roof & Roof Supports (see drawing diagram for reference)
A.) All roofs must be full size. Half-moon roofs will not be permitted. The roof may not be mounted more than 12” (twelve inches) past the rear axle.
B.) Wings, roof spoilers or ground effects of any kind will not be permitted.
C.) All flat type roofs will be allowed a maximum 1”-inch difference in height between the front of the roof and the rear of the roof.
D.) All curved type roofs will be allowed a maximum of 5”-inches in the front and 2”-inches in the rear. The break in the roof must be within 6”-inches from the center of the roof.
E.) Wedge roofs will not be permitted.
F.) Dished roofs will not be permitted. Roofs must be rounded side-to-side. Bead rolls will be permitted.
G.) The rear roof supports may not extend past the front side of rear upright of the roll cage.
H.) The side vents on the front roof posts may extend rear ward from the lowest point, a maximum of 16”-inches, then at a 90 degree angle to roof for one (1) configuration, side vents must meet the outside of the car.
I.)The roof side panel window size must be a minimum of 10”-inches x 15”-inches and must match drawing number -2- side view. A maximum crown of two (2) inches will be permitted, measured from the center of a common tangent point on either side of the crown.
J.) Any sun shield must be on hinge for easy exiting, taping will not be permitted. The window opening must remain at a minimum of 12”-inches.
K.) All race cars must meet the measurements illustrated in the DIRTcar drawing
L.) There are only 5 (five) approved roof supports to choose from.
M.) The roof should be single thickness of material. The roll bar hoops must be exposed for inspection.
N.) Flat type roofs will be measured from the front edge of the roof down to the interior and measured from the rear edge down to the interior, assuming a flat interior. A 1”-inch difference between the two measurements will be permitted. If the interior has been changed, the measurement will be from the front edge of the roof to the ground, and the rear edge of the roof to the ground. A one inch difference between the two measurements will be permitted.
O.) If the roof is curved then a level will be placed on the top of the car and if the roof is 5”- inches or less in the front and 2”-inches or less in the rear and the break is in the middle then the roof will be permitted.
P.) The roofs on these cars will be stock appearing. If a DIRTcar and/or local track official determines the roof does not meet the requirements as stated above then a penalty as determined by the official may be determined prior to competition, additional weight and/or other penalties, unless the roof can be returned to within the parameter as stated above prior to competition in the event that the roof was inspected for.
15.7 – Suspension
A.) Any “live axle”-type rear ends will not be permitted.
B.) Quick change rear ends will be permitted. Only magnetic steel tubes will be permitted.
C.) Aluminum birdcages will not be permitted.
D.) Independent rear suspensions will not be permitted.
E.) Only floater hub assemblies will be permitted.
F.) The front suspension must be O.E.M. and be in stock location. The front suspension must have replaceable stock part(s) from the same type of suspension.
G.) Aluminum spools will be permitted.
H.) Steel coil-over eliminators and/or steel/aluminum coil-over kits will be permitted. The coil-over eliminators and/or coil-over kits must conform to the shock and spring rules. In the rear of the car a minimum 5”-inch spring is required.
I.) All springs must have a tethered and/or cable system in place to securely fasten them in position in the car.
J.) Aluminum shocks, shells, aluminum hubs, aluminum A-frames, aluminum rear-end, aluminum tubes and/or other aluminum suspension parts will not be permitted.
K.) Only steel body, one piece non-adjustable shocks will be permitted. Adjustable shocks will not be permitted.
L.) Coils over shocks of any type on the front of the car will not be permitted.
M.) Only one shock per wheel will be permitted. Lay down shocks less than 12” (twelve inches) away from brake rotor will not be permitted. Additional shocks in other locations will be permitted.
N.) The shock absorber claim will be $120.00 per shock absorber.
O.) Only stock passenger car spindles will be permitted. Fabricated spindles will not be permitted.
P.) Alterations and/or relocation of the lower A-frames will not be permitted. DIRTcar approved after-market lower control arms, which are mounted in the OEM location will be permitted. All after-market lower control arms must have an official DIRTcar-approved and numbered decal displayed for ease of inspection at all times.
Q.) Tubular-type upper A-frames will be permitted. The upper A-frame mounting locations may be altered. Aluminum cross shafts will be permitted.
R.) Composite leaf springs will be permitted.
S.) Aluminum shackles will be permitted.
15.7.1 – Brakes
A.) All cars must be equipped with a working braking system on all four wheels and all four wheels must be able to stop/brake at all times.
B.) Only magnetic steel rotors will be permitted. Carbon fiber and/or aluminum rotors will not be permitted. Drilling, lightening and/or any alteration to the brake rotors or calipers will not be permitted.
C.) Only stock O.E.M. calipers will be permitted.
D.) Only stock O.E.M. rotors will be permitted. Single disc brake rotors or scalloped rotors will not be permitted.
15.8 – Wheels and Tires
A.) The tire rule may be amended by bulletin.
B.) The DIRTcar Northeast UMP Modified Series approved tire is the Hoosier DCM-400. The maximum width of the tire will be 9” inches.
C.) Grooving of any tire will not be permitted. Siping will be permitted. Recapping of an approved tire is not permitted.
D.) Any local track and/or DIRTcar official can confiscate any tire at any time and during any DIRTcar event to be evaluated and analyzed including verification using a tire durometer. Tires may also be submitted for further chemical analysis.
E.) Defacing or altering any of the manufacturer’s identification markings, letters, words, numbers, on any tire will not be permitted. The tire compounds may be covered by duct tape as long as the local track and/or DIRTcar officials are able to remove the covering at any time for inspection purposes. Any alteration of tires may result in immediate suspension from all DIRTcar racetracks and/or events and/or penalties deemed appropriate by local track and/or DIRTcar and/or World Racing Group Supervisory Officials.
F.) Tire softeners and/or chemicals designed to alter the chemical characteristics of the tire and/or the tire surface will not be permitted.
G.) Mud plugs are will be permitted on all four wheels. Bead locks will be permitted on the right side only. The mud plug must have the car number on it.
H.) Only 8-inch DIRTcar approved and labeled racing wheels will be permitted.
I.) All wheels must be conventional one-piece magnetic steel and must be mounted with lug nuts. Aluminum, plastic and/or carbon fiber wheels will not be permitted.
J.) All wheels must be fastened to the hub with five lug nuts.
15.9 – Personal Protection Equipment
15.9.1. General
A.) It is the sole responsibility of each competitor for the effectiveness and proper installation, per the manufacturer’s specifications to be adequate for competition at every event. Each competitor is expected to investigate and educate themselves for continuing improvement regarding their own personal safety equipment.
15.9.2 Seat Belt/Restraint System
A.) Each car should be equipped with an SFI 16.5 or SFI 16.1 approved seat belt restraint system until the date of the belt expiration (usually two years). Seat belts restraint systems shall be installed in accordance with the directions and application of the system supplier or manufacturer.
B.) Seat belt webbing that comes into contact with any sharp or unradiused metal edge should be protected from that edge by means of push on grip vinyl trim.. Seat manufacturers supply the seat with trim protecting the webbing from abrasion or cutting under impact conditions and should be used to their specifications.
C.) It is the responsibility of the driver, not the Officials or the Promoter to ensure that his/her seat belt restraint system and all components are SFI approved, correctly installed, maintained and properly used.
15.9.3 Protective Clothing
A.) Each driver should wear a fire resistant uniform meeting the SFI 3.2A/5 specification and display a valid SFI 3.2A/5 label.
B.) Each driver should also wear fire resistant accessories that effectively cover the remaining parts of the body. Shoes and gloves should meet the SFI 3.3 specification and display a valid SFI.3label.
15.9.4 Seats
A.) An aluminum seat built specifically for the purpose of competition in auto-racing events will be required
B.) High-back Aluminum (stockcar style) seats should be securely mounted to the frame as recommended/required by seat manufacturer and chassis manufacturer.
C.) Head rest (behind the head) should include padding. All areas surrounding the head should have padding
D.) A right head net or support is required. Head nets must be equipped with quick release mechanisms
E.) The seat must be mounted a minimum of 30” (inches) from the center of the rear end, measured at the bottom of the seat
15.9.5 Helmets
A.) Driver should wear a full face helmet, with at least a valid SA 2000 or SA 2005 Standard Snell and/or a valid SFI 31.1, SFI 31.2 or SFI 31.1 2000 label.
B.) The driver should wear the helmet in accordance with the directions provided by the helmet manufacturer and/or supplier.
C.) If a head and neck restraint system is connected it should conform to the manufactures mounting instructions.
D.) Head and Neck restraints are strongly recommended.
15.9.6 Other
A.) No sharp or protruding edges in or around the cockpit, which would impede the driver’s rapid exit from the car.
B.) Windshield screens with a minimum of .090 inch screens must be securely fastened
C.) An electrical engine shut off switch is required. The switch must be clearly labeled and within the reach of the driver.
D.) A fuel shut off valve is required. The valve must clearly labeled and within reach of the driver.
E.) Flame retardant seat, roll bar, knee and steering pads or padding are recommended
15.10 – Roll Cage
A.) All cars must have a roll cage. The roll cage must be approved prior to competition and it must be welded to the frame. The driver’s head must not protrude above the top of the roll cage with the driver’s helmet on. The top of the roll cage must extend above the top of the driver’s helmet by a minimum of one (1) inch. The entire roll cage and all roll bar pieces must be fabricated from magnetic steel a minimum of .095” in thickness.
B.) The driver side door bars must be parallel to the ground and located perpendicular to the driver. The side bars must be welded to the front and rear of the roll cage. No brazing or soldering is permitted. The door bars must have a minimum thickness of .095” and must have a minimum of 1-1/2” diameter. On the driver’s side there will be a minimum of three (3) door bars.
C.) Foot protection is mandatory. One piece of magnetic steel tubing, a minimum .095” in thickness, must be fastened and/or welded across the back of the engine with vertical tubing a minimum of .095” thick.
D.) The door side roll bars are mandatory and must extend into the door panels.
E.) The roll cage must consist of continuous hoops that are no less than 1-1/2” in diameter and must a minimum thickness of .095”.
F.) The roll cage must be mounted securely (welded) to the frame in a minimum of 6 (six) places.
G.) The roll cage must consist of a configuration of front and rear hoops connected by tubing on the sides and/or side hoops. Roll cage must be securely supported and braced. Gussets to brace any portion of the roll cage will be permitted.
15.11 – Other
Section 15.11.1 – Electronic Devices & Traction Control
A.) All electronic and/or computerized wheel spin and/or acceleration retardation traction control devices will not be permitted. Controlled timing devices attached to or controlling accelerator or rotation of wheel will not be permitted.
B.) All traction control devices utilizing wheel sensors and/or any means of measuring ground speed to control wheel spin will not be permitted.
C.) Adjustable ping control devices, dial a chip controls, timing controls or automated throttle controls will not be permitted in cockpit or driver accessible areas.
D.) Adjustable restrictor plates will not be permitted.
E.) Any remotely controlled components inside or outside the cockpit of any competitor’s racecar will not be permitted.
F.) Radios or devices for transmitting voice or data will not be permitted, either in the racecar or on anyone connected with the car.
G.) The uses of pit boards or colored flashlights are prohibited
15.14 SERIES DECALS AND PATCHES
A.) All participants shall display required decals as provided on decal verification sheet to be allowed to compete.
B.). Series Decal on both side of the car is mandatory, Drivers series patch mandatory to receive point fund distribution.
C.). To receive any contingency sponsorship awards, team must meet the requirements of the award such as; decals, patches, product use, product verification.
(Southern UMP Modified, East Coast UMP Modified, Western UMP Modified, Limited UMP Modified)
v Under the guideline of the 2012 DIRTcar UMP Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules applies to all divisions, except in instances where any local track rules, pertaining to any item are listed in the local track rules, whether that is in the technical components and/or the racing procedures and/or overall rules that are administered by the local track officials and management. In those instances and where applicable, the local track rules shall prevail.
v The 2012 DIRTcar UMP Modified Rules have been established to include the rules in several different regions ofNorth America, refer to the rules that are in effect in your region.
v The following are the 2012 UMP Modified rules. All amendments supersede any previous rules regarding any technical article and/or aspect.
v Under the guideline of the 2012 UMP Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules apply to all sanctioned divisions.
v The specifications published shall be considered a section of the “Official Rules and Specifications” for all events, series and sanctions by World Racing Group. All sections should be considered when determining specifications and governance.
Midwest Limited UMP Modified
15.0 Rule Addendums
15.1.C. Only Steel Cylinder Heads and Steel Blocks will be permitted.
15.1.I. Only a single 500 CFM Holley 2 Barrel carburetor will be permitted.
15.1.M Only Flat Tappet Cams will be permitted.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,400 lbs.
15.4.F The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier A-40 compound in the DIRTcar plated tire 26.5/8.0/15 or 27.5/8.0/15. The maximum width of the tire will be 9” inches.
UMP Limited Modified
15.0 Rule Addendums
15.1.A Only the GM 602 Crate Motor will be permitted for competition.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier A-40 compound in the DIRTcar plated tire 26.5/8.0/15 or 27.5/8.0/15. The maximum width of the tire will be 9” inches.
Deep South UMP Modified
15.0 Rule Addendums
15.1.C. Only Steel Cylinder Heads and Steel Blocks will be permitted.
15.1.I. Only a single 500 CFM Holley 2 Barrel carburetor will be permitted.
15.1.M Only Flat Tappet Cams will be permitted.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,600 lbs.
15.4.F The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier E-Mod “B” compound in the DIRTcar plated tire 26.0/8.0/15 or 26.5/8.0/15. The maximum width of the tire will be 9” inches.
Western UMP Modified (Barnett)
15.0 Rule Addendums
15.1.C Only Steel Cylinder Heads and Steel Blocks will be permitted.
15.1.H The exhaust system(s) must be mounted with the exhaust directed away from the vehicle and/or away from the ground (preferably horizontal and outside the body of the car). A maximum of 1/2” inch clearance surrounding the header pipe when directed through the firewall on the driver’s side. Local track rules will prevail when decibel and/or muffler rules.
The following mufflers are recommended for competition in All Western Region Events;
Extreme Technologies – P/N 21435; P/N 35835
15.1.I. Only a single 500 CFM Holley 2 Barrel carburetor will be permitted.
15.1.M Only Flat Tappet Cams will be permitted.
15.2.E Bert and/or Brinn type Transmissions will not be permitted.
15.7.N In 2012 the DIRTcar approved “B” or “C” shocks will be the only shock absorbers permitted. For the 2012 season the shock absorber claim will be $120.00 per shock absorber.
15.4.D The minimum weight of car with driver at all times including after the race is 2,600 lbs.
15.4.F The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
15.8.B The DIRTcar UMP approved tire is the Hoosier E-Mod “B” compound in the DIRTcar plated tire 26.0/8.0/15 or 26.5/8.0/15. The maximum width of the tire will be 9” inches.
DIRTcar Pro Modified Rules:
2012 Pro Modified Rules
TO ALL COMPETITORS/PARTICIPANTS
Under the guideline of the 2012 DIRTcar Pro Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules applies to all divisions, except in instances where any local track rules, pertaining to any item are listed in the local track rules, whether that is in the technical components and/or the racing procedures and/or overall rules that are administered by the local track officials and management. In those instances and where applicable, the local track rules shall prevail.
The 2012 DIRTcar Pro Modified Rules have been established to include the rules in several different regions ofNorth America, refer to the rules that are in effect in your region.
The following are the 2012 Pro Modified rules. All amendments supersede any previous rules regarding any technical article and/or aspect.
Under the guideline of the 2012 Pro Modified rules any and/or rules and as stated in the 2012 DIRTcar Rule Book, all DIRTcar rules apply to all sanctioned divisions.
The specifications published shall be considered a section of the “Official Rules and Specifications” for all events, series and sanctions by World Racing Group. All sections should be considered when determining specifications and governance.
15.0 UMP Modifieds
ANY CAR, TEAM AND/OR DRIVER THAT DOES NOT MEET THESE SPECIFICATIONS AND/OR EQUIPMENT REQUIREMENTS WILL BE SUBJECT TO PENALTIES AS DETERMINED BY THE DIRTcar and/or World Racing Group OFFICIALS
15.1 – Engine
A.) Any American cast iron and/or steel made engine(s) will be permitted as long as the rear of the engine bell housing flange is mounted at least 72”-inches forward from the center of the rear axle. The engine offset must remain within two (2”) inches of the center line from the cross member. The minimum engine height when measured from the ground to the center of the crankshaft is 11” inches.
B.) All engines used in competition must be able to be used in a conventional passenger car without alteration. Alteration of motor mounts will not be permitted. Alteration of the castings and/or fittings will not be permitted. Any machine work on the outside of the engine or machine work on the front or rear of the crankshaft will not be permitted.
C.) Steel and/or cast iron Aftermarket and OEM performance engine blocks will be permitted.
D.) Only flat tappet cam, lifter and stud mounted rocker arms will be permitted. Mushroom and/or mushroom type lifters will not be permitted. Stud girdles will not be permitted.
E.) Steel and aluminum cylinder heads will be permitted. Any engine with aluminum cylinder heads must add an additional 50 lbs in front of the engine plate.
F.) Only magnetic steel oil pans will be permitted.
G.) Aluminum blocks will not be permitted.
H.) Crank triggers and Magnetos will not be permitted.
I.) Wet sump oiling systems must be operative and will go with a claim by DIRTcar officials. Overall dry sump systems will not be permitted.
J.) Alteration to the cooling system will be permitted. If alterations to the cooling system are made the stock-appearing hood line must be maintained.
K.) The battery must be securely mounted and shielded. The battery must not be mounted inside the driver’s cockpit.
L.) The exhaust system(s) must be mounted with the exhaust directed away from the vehicle and/or away from the ground (preferably horizontal and outside the body of the car). A maximum of 1/2” inch clearance surrounding the header pipe when directed through the firewall on the driver’s side. Local track rules will prevail when decibel and/or muffler rules.
M.) One two or four barrel carburetor is required.
N.) The engine must be a normally aspirated configuration.
O.) Fuel injection systems or electric fuel pumps will not be permitted.
P.) The GM Performance 602 ‘Crate’ Engine will be permitted for competition, provided they are sealed and meet all DIRTcar Crate Engine stock specifications.
Q.) There may be specific engine rules issued for each region ofNorth Americathat deviate from the standard UMP Modified Engine rules included herein.
15.1.1 Engine Claims
A.) Any qualified UMP Modified competitor has the right to claim any engine at any time during an UMP Modified event. To begin the claim a $750.00 fee, plus the agreement to an engine exchange in addition to $50.00 for the tow truck operator. All claims do not include: flywheel, clutch, pressure plate, bell housing, headers, carburetor, starter, fan & pulleys, motor mount, sending units and switches for oil pressure and water temperature, carburetor adaptor, clutch ball, clutch arm, throw out bearings, dip stick, water pump, distributor, plug wires or fuel pump.
B.) Any competitor who processes a claim must have taken the checkered flag in the feature race and have finished the feature race on the ‘lead lap’. The claim must be presented in cash or certified check to promoter or designated DIRTcar official within five (5) minutes after the completion of the feature race. The driver must have the claim payment and his/her DIRTcar current/valid membership and claim card available. A third party cannot provide these items to the claiming driver. (Yearly membership runs from January 1 through December 31.) All claims, positive or negative, must be reported immediately to DIRTcar headquarters by the event promoter and/or chief steward of the event. Drivers will only have the ability to make two (2) claims in any UMP Modified season. A driver can claim another driver’s engine only once during the year. Only the engine of the event winner can be claimed. In case of multiple claims on the same engine, the engine will go to a qualified driver who finished the furthest back in the field on the lead lap. Drivers may not claim an engine if he/she has spun out and caused a caution period. If a claim is refused, the claim is not held against the claiming driver. The claim rule is intended to maintain cost effectiveness and a level playing field in the UMP Modified division.
C.) Any driver making a claim must drive his/her car immediately after the finish of the feature, under its own power, directly to the claiming area. Only drivers and officials will be permitted in the claim area. The claim area must be designated by the promoter to all drivers at the driver’s meeting prior to the feature event. The feature winner must go to the claim area immediately following the finish of the feature event. If no driver comes immediately to the claiming area, the winner may proceed as directed.
D.) The claimed engine must be completely removed within one (1) hour from the time the claim is made.
E.) The first sell/no sell or trade of the engine by the driver being claimed is considered binding.
F.) Only a qualified driver may claim an engine and only the winning driver may agree to sell.
G.) Any refusal to sell forfeits all cash, trophies and contingency winnings for the feature as well as all DIRTcar State and Nationals points’ award for that night. Any driver refusing to sell his/her engine the first time is fined $200.00 and is suspended for the next racing event at their home track and one (1) week from all DIRTcar sanctioned race tracks. The second infraction for a driver refusing to sell their engine is a $600.00 fine and a suspension from all DIRTcar sanctioned tracks for 30-days.
H.) All claimed engines must be removed from the car at the track. The buyer must examine the engine before removal. Once removal has started, the sale is final. Any sabotage to claim an engine will result in the saboteur being suspended from all DIRTcar races for 30-days and until the fine of $1,000.00 is paid to DIRTcar.
I.) To claim an engine, the claiming driver must have raced at least one-half of the sanctioned events at the sanctioned track where the claim is made or at a minimum the three (3) most recent consecutive feature events at that track. A driver can have his/her engine claimed at any time. No claim can be made against a driver on his/her first night at a sanctioned track.
15.2 Transmission & Driveline
A.) The drive shaft must be made from magnetic steel. The driveshaft must be painted white with the car number clearly labeled on the drive shaft.
B.) Aluminum, fiberglass, or carbon fiber drive shafts will not be permitted.
C.) A 1/2”-ince x 2”-inch 18-gauge steel drive shaft hoop is mandatory. The drive shaft hoop must be at least six (6”) inches behind the universal-joint. Two hoops are strongly recommended.
D.) All competitors are encouraged to perform systematic checks on their drive-train.
E.) Direct drives and/or any type devices will not be permitted.
F.) The transmission must be bolted to the engine. All cars must have forward and working reverse gears and be able to shift to forward or reverse with engine running. BERT-type transmissions will be permitted.
G.) Clutch-type transmissions must be equipped with explosion-proof steel bell housing. In lieu of an explosion-proof bell housing or if one is not available for your engine, a shield of at least 1/2”-inch x 6”-inches covering the clutch area 360 degrees securely fastened in place and fabricated from magnetic steel will be permitted.
H.) The steering box must be O.E.M. Any-type rack and pinion style steering will not be permitted. The original bolt pattern that matches frame type must be used. In the cockpit, steering may be modified to suit the driver but must remain on the left side of the vehicle. Moving the steering mechanisms to the center of the vehicle will not be permitted.
15.3 Chassis/Frame
A.) Only factory production full 1950 or newer parallel American passenger car frames will be permitted. The frame must be complete in front of firewall. Cutting of the frame in any way in front of firewall will not be permitted.
B.) The frame must remain unaltered and must meet the requirements of the attached drawing.
C.) The right side frame rail may not be altered and/or raised and/or moved from the stock OEM location in any manner and must measure a maximum of six (6) inches from the ground to the bottom or lowest edge of the frame rail.
D.) The front cross member may be notched to allow clearance for the radiator only. The cross members must be plated to retain complete box configuration.
E.) Jeep, Bronco, 4-wheel drive, front wheel drive or sports car frames will not be permitted.
F.) The minimum wheelbase permitted will be 108” inches. The maximum wheelbase permitted will be 112” inches.
G.) The rear of the frame may be altered to accept leaf or coil springs. Any coil spring must be a minimum of 4-1/2” diameter.
H.) Fiberglass lift bars and/or rear torsion bars will not be permitted.
I.) Any frame may not be widened or narrowed and must be able to support the roll cage on both sides and must be full and complete on both sides.
J.) The minimum frame and body height from ground is four (4) inches.
K.) The front bumper must be mounted to the ends of the frame with the bottom loop parallel to the ground.
L.) A minimum of 1” diameter tubing and/or pipe is required to for towing of the vehicle.
M.) The rear bumpers must be constructed of tubing and/or flat stock. The rear bumpers must protect the fuel cell.
N.) The bumper(s) (front and rear) when measure from their center(s) must have a minimum of 25” inches of ground clearance. There will be a two (2) inch tolerance, plus or minus regarding this dimension. The rear bumper and/or the nerf bars must not extend beyond the width of rear tires. All bumpers must have round edges. Sharp edges on any bumper and/or bumper surface will not be permitted.
O.) The brace bars forward of the roll cage must not extend higher than stock hood height.
P.) The rear push bars must not extend beyond six (6”) inches of the rear quarter panel(s).
Q.) All side bars and bumpers must be capped on ends.
R.) The maximum overall width of the car, front and/or rear, shall not exceed 78” inches when measured from the outside of the tire tread on both sides of the vehicle. A maximum one (1”) inch spacer between the hub and wheel will be permitted. Steel and/or aluminum spacers will be permitted, provided the overall width of the vehicle does not exceed 78”-inches.
15.4 Weight
A.) All added weight(s) must be painted white with the car number clearly labeled on each weight.
B.) All added weight(s) must be securely mounted to car with minimum of two (2) 1/2”-inch bolts that pass completely through each weight and the car. Weights that are mounted on the rear bumper or outside the body of the car will not be permitted. All added weight must be mounted below all windows and the interior sheet metal.
C.) Any car that loses any weight(s) during any event may be fined up to $500.00.
D.) The minimum weight of car with driver at all times including after the race is 2,400 lbs. The minimum weight for a car with aluminum cylinder heads after the race will be 2,450 lbs.
E.) The 602 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2250 lbs.
F.) The 604 GM Crate Motor will be permitted with a minimum weight with driver at all times will be 2300 lbs.
F.) All weight determinations will be measured on the scales selected by the local track officials and/or by DIRTcar Officials for each racing event. There will be no weight tolerance after the completion of any racing event.
15.5 Fuel Cells and Fuel
A.) All cars must have fuel cells. The maximum capacity for the fuel cell will be 32 gallons. The fuel cell must be completely enclosed in an 18-gauge magnetic steel container. Aluminum fuel cell containers will not be permitted. All fuel cells must be completely visible. All fuel cells must have a minimum of 2”x2” inch x 1/8”-inch steel straps surrounding them. The fuel cell must be protected in the rear of axle by securely-mounted (welded) roll cage tubing.
B.) Any driver competing with a fuel cell that has a capacity greater than 32-gallons will lose all winnings and points for that event and fined $1,000.00.
C.) Any driver must be prepared to drain fuel upon request for measurement of the fuel cell.
D.) The fuel cell must not extend lower than protective tubing.
E.) Racing gasoline or alcohol will be permitted.
F.) Nitrous oxide, nitrous methane, propylene oxide or any type of additives will not be permitted.
G.) Fuel may be inspected at any time during any event.
H.) All fuel cells must have check valve in breather and filler check valve.
15.6 – Body
(See drawing diagram for reference – There may be dimensions referenced in the drawing diagram that are not referenced in written rules and vice versa. All dimensions whether written and/or referenced in the drawing diagram dimensional are rule(s),)
A.) All bodies must follow dimension(s) and the appearance as shown in diagram. The body shall be the fabricated modified body from approved vendors.
B.) The front windshield and rear window support must be stock appearing. The front window support(s) may have a clear Lexan support of no more than 16” inches including the roof post at the bottom and going straight to the roof. The support must be securely fastened in a positive manner.
C.) The front roof post must be in a straight line from top to bottom.
D.) The sides of the engine compartment will remain open. Any side panels in the engine compartment area will not be permitted. A five (5”) inch drop on either side of the hood will be permitted and it must enclosed at the rear of the hood. The firewall on driver’s side must meet the front of the door.
E.) The top of the doors must remain in line with the rear engine plate. The bottom of the doors may extend a maximum of eight (8”) inches past the motor plate toward the front of the vehicle.
F.) The side fins and/or flanges of any kind along the length of the entire car (hood, front – nose and/or roof) will not be permitted.
G.) The bodies should extend no further forward than the back of the block.
H.) A maximum of one (1) stone deflector, for rear mounted oil pumps, oil filters, and for the main oil tank will be permitted. The deflector may be made of steel, aluminum, or heavy gauge wire. The cover may only be mounted near the unit it is designed to protect with a maximum size of eighteen (18”x18”) inches square and mounted only from the upper right frame rail to the lower right frame rail.
I.) The minimum roof height is 42” inches with a maximum height of 52” inches.
J.) The minimum deck height is 28” inches with a maximum height of 38” inches.
K.) All cars must have a car number on both sides and the roof that are at least 18” inches in height and 14” inches in width.
L.) The driver’s last name must be displayed under the car number in a legible font that is a minimum of eight (8”) inch high letters.
M.) There must be a minimum of two (2”) inches of tire clearance from the body.
N.) The minimum ground clearance will be four (4”) inches.
O.) The measurement from center of the hub to the rear top of deck will be a minimum of 34” inches and a maximum of 48” inches.
P.) The maximum body width at the body’s widest part will be 68” inches. The minimum of width at the body’s narrowest part will be 53” inches. The bottom of the doors may have a maximum width of 68” inches.
Q.) On the left side the rear of the door may flare out six (6”) inches for tire clearance.
R.) The bottom of the flare must be curved and rounded not pointed in any fashion.
S.) The maximum rear width of car must be 67” inches at the widest point.
T.) The maximum roof width will be 50” inches with a minimum of 44” inches.
U.) The maximum roof length will be 56” inches with a minimum roof length of 41” inches.
V.) The maximum height on rear roof post vertical is 5” inches.
W.) The nose piece shall not be longer or wider than frame horns and shall not attached any further back than the radiator. The nose piece must not extend past the leading edge of the front bumper. The nose piece must have a minimum of six (6”) inches from the ground to the bottom edge of the nose piece.
X.) The spoiler shall be a maximum of 5” inches tall. Any spoiler angle will be permitted. Three (3) spoiler supports may be used; this includes side spoilers. The spoiler supports and side spoilers shall be 5” inches tall in the back and 2” inches tall in the front with a maximum total length of 12” inches at the bottom.
Y.) The spoiler may be fabricated from lexan or aluminum. You may use the roof post/spoiler kit. The kit has the roof post and spoiler fabricated in one piece. If the kit is utilized the spoiler height must remain 5” inches.
15.6.1 – Interior and Driver Compartment
A.) All windows must have a minimum 11”-inch vertical opening. The entire interior must have 11”-inches of clearance from the interior deck to the roof and all sections of the roll cage. *** – For 2012 it is highly recommended and mandatory in 2012; The minimum window opening will be 12”inches. The interior deck sheet metal to the right side of the driver must be fabricated on an angle from the driveshaft tunnel to the right side window to promote ease of exit for the driver through the right side and or front window opening.
B.) A master ignition switch within easy reach of the driver is mandatory. The switch must be clearly labeled “ON” and “OFF”.
C.) Hydraulic and/or pneumatic weight jacks, trackers, or similar adjustable components of any type will not be permitted.
D.) Mirrors of any type will not be permitted.
E.) The rock guard should end at a point perpendicular to the steering wheel.
F.) The drivers compartment must be sealed from the engine and the race track. The rear bubble of the hood should be closed and sealed from the driver.
G.) The maximum slope/rake of the interior sheet metal “shelf” front-to-rear is 4”-inches. The interior sheet metal must remain flat and level from side-to-side.
H.) The top of the interior must be flush with the top of door and quarter panels.
15.6.2 – Roof & Roof Supports (see drawing diagram for reference)
A.) All roofs must be full size. Half-moon roofs will not be permitted. The roof may not be mounted more than 12” (twelve inches) past the rear axle.
B.) Wings, roof spoilers or ground effects of any kind will not be permitted.
C.) All flat type roofs will be allowed a maximum 1”-inch difference in height between the front of the roof and the rear of the roof.
D.) All curved type roofs will be allowed a maximum of 5”-inches in the front and 2”-inches in the rear. The break in the roof must be within 6”-inches from the center of the roof.
E.) Wedge roofs will not be permitted.
F.) Dished roofs will not be permitted. Roofs must be rounded side-to-side. Bead rolls will be permitted.
G.) The rear roof supports may not extend past the front side of rear upright of the roll cage.
H.) The side vents on the front roof posts may extend rear ward from the lowest point, a maximum of 16”-inches, then at a 90 degree angle to roof for one (1) configuration, side vents must meet the outside of the car.
I.)The roof side panel window size must be a minimum of 10”-inches x 15”-inches and must match drawing number -2- side view. A maximum crown of two (2) inches will be permitted, measured from the center of a common tangent point on either side of the crown.
J.) Any sun shield must be on hinge for easy exiting, taping will not be permitted. The window opening must remain at a minimum of 12”-inches.
K.) All race cars must meet the measurements illustrated in the DIRTcar drawing
L.) There are only 5 (five) approved roof supports to choose from.
M.) The roof should be single thickness of material. The roll bar hoops must be exposed for inspection.
N.) Flat type roofs will be measured from the front edge of the roof down to the interior and measured from the rear edge down to the interior, assuming a flat interior. A 1”-inch difference between the two measurements will be permitted. If the interior has been changed, the measurement will be from the front edge of the roof to the ground, and the rear edge of the roof to the ground. A one inch difference between the two measurements will be permitted.
O.) If the roof is curved then a level will be placed on the top of the car and if the roof is 5”- inches or less in the front and 2”-inches or less in the rear and the break is in the middle then the roof will be permitted.
P.) The roofs on these cars will be stock appearing. If a DIRTcar and/or local track official determines the roof does not meet the requirements as stated above then a penalty as determined by the official may be determined prior to competition, additional weight and/or other penalties, unless the roof can be returned to within the parameter as stated above prior to competition in the event that the roof was inspected for.
15.7 – Suspension
A.) Any “live axle”-type rear ends will not be permitted.
B.) Quick change rear ends will be permitted. Only magnetic steel tubes will be permitted.
C.) Aluminum birdcages will not be permitted.
D.) Independent rear suspensions will not be permitted.
E.) Only floater hub assemblies will be permitted.
F.) The front suspension must be O.E.M. and be in stock location. The front suspension must have replaceable stock part(s) from the same type of suspension.
G.) Aluminum spools will be permitted.
H.) Steel coil-over eliminators and/or steel/aluminum coil-over kits will be permitted. The coil-over eliminators and/or coil-over kits must conform to the shock and spring rules. In the rear of the car a minimum 5”-inch spring is required.
I.) All springs must have a tethered and/or cable system in place to securely fasten them in position in the car.
J.) Aluminum shocks, shells, aluminum hubs, aluminum A-frames, aluminum rear-end, aluminum tubes and/or other aluminum suspension parts will not be permitted.
K.) Only steel body, one piece non-adjustable shocks will be permitted. Adjustable shocks will not be permitted.
L.) Coils over shocks of any type on the front of the car will not be permitted.
M.) Only one shock per wheel will be permitted. Lay down shocks less than 12” (twelve inches) away from brake rotor will not be permitted. Additional shocks in other locations will be permitted.
N.) The shock absorber claim will be $120.00 per shock absorber.
O.) Only stock passenger car spindles will be permitted. Fabricated spindles will not be permitted.
P.) Alterations and/or relocation of the lower A-frames will not be permitted. DIRTcar approved after-market lower control arms, which are mounted in the OEM location will be permitted. All after-market lower control arms must have an official DIRTcar-approved and numbered decal displayed for ease of inspection at all times.
Q.) Tubular-type upper A-frames will be permitted. The upper A-frame mounting locations may be altered. Aluminum cross shafts will be permitted.
R.) Composite leaf springs will be permitted.
S.) Aluminum shackles will be permitted.
15.7.1 – Brakes
A.) All cars must be equipped with a working braking system on all four wheels and all four wheels must be able to stop/brake at all times.
B.) Only magnetic steel rotors will be permitted. Carbon fiber and/or aluminum rotors will not be permitted. Drilling, lightening and/or any alteration to the brake rotors or calipers will not be permitted.
C.) Only stock O.E.M. calipers will be permitted.
D.) Only stock O.E.M. rotors will be permitted. Single disc brake rotors or scalloped rotors will not be permitted.
15.8 – Wheels and Tires
A.) The tire rule may be amended by bulletin.
B.) The DIRTcar Northeast UMP Modified Series approved tire is the Hoosier DCM-400. The maximum width of the tire will be 9” inches.
C.) Grooving of any tire will not be permitted. Siping will be permitted. Recapping of an approved tire is not permitted.
D.) Any local track and/or DIRTcar official can confiscate any tire at any time and during any DIRTcar event to be evaluated and analyzed including verification using a tire durometer. Tires may also be submitted for further chemical analysis.
E.) Defacing or altering any of the manufacturer’s identification markings, letters, words, numbers, on any tire will not be permitted. The tire compounds may be covered by duct tape as long as the local track and/or DIRTcar officials are able to remove the covering at any time for inspection purposes. Any alteration of tires may result in immediate suspension from all DIRTcar racetracks and/or events and/or penalties deemed appropriate by local track and/or DIRTcar and/or World Racing Group Supervisory Officials.
F.) Tire softeners and/or chemicals designed to alter the chemical characteristics of the tire and/or the tire surface will not be permitted.
G.) Mud plugs are will be permitted on all four wheels. Bead locks will be permitted on the right side only. The mud plug must have the car number on it.
H.) Only 8-inch DIRTcar approved and labeled racing wheels will be permitted.
I.) All wheels must be conventional one-piece magnetic steel and must be mounted with lug nuts. Aluminum, plastic and/or carbon fiber wheels will not be permitted.
J.) All wheels must be fastened to the hub with five lug nuts.
15.9 – Personal Protection Equipment
15.9.1. General
A.) It is the sole responsibility of each competitor for the effectiveness and proper installation, per the manufacturer’s specifications to be adequate for competition at every event. Each competitor is expected to investigate and educate themselves for continuing improvement regarding their own personal safety equipment.
15.9.2 Seat Belt/Restraint System
A.) Each car should be equipped with an SFI 16.5 or SFI 16.1 approved seat belt restraint system until the date of the belt expiration (usually two years). Seat belts restraint systems shall be installed in accordance with the directions and application of the system supplier or manufacturer.
B.) Seat belt webbing that comes into contact with any sharp or unradiused metal edge should be protected from that edge by means of push on grip vinyl trim.. Seat manufacturers supply the seat with trim protecting the webbing from abrasion or cutting under impact conditions and should be used to their specifications.
C.) It is the responsibility of the driver, not the Officials or the Promoter to ensure that his/her seat belt restraint system and all components are SFI approved, correctly installed, maintained and properly used.
15.9.3 Protective Clothing
A.) Each driver should wear a fire resistant uniform meeting the SFI 3.2A/5 specification and display a valid SFI 3.2A/5 label.
B.) Each driver should also wear fire resistant accessories that effectively cover the remaining parts of the body. Shoes and gloves should meet the SFI 3.3 specification and display a valid SFI.3label.
15.9.4 Seats
A.) An aluminum seat built specifically for the purpose of competition in auto-racing events will be required
B.) High-back Aluminum (stockcar style) seats should be securely mounted to the frame as recommended/required by seat manufacturer and chassis manufacturer.
C.) Head rest (behind the head) should include padding. All areas surrounding the head should have padding
D.) A right head net or support is required. Head nets must be equipped with quick release mechanisms
E.) The seat must be mounted a minimum of 30” (inches) from the center of the rear end, measured at the bottom of the seat
15.9.5 Helmets
A.) Driver should wear a full face helmet, with at least a valid SA 2000 or SA 2005 Standard Snell and/or a valid SFI 31.1, SFI 31.2 or SFI 31.1 2000 label.
B.) The driver should wear the helmet in accordance with the directions provided by the helmet manufacturer and/or supplier.
C.) If a head and neck restraint system is connected it should conform to the manufactures mounting instructions.
D.) Head and Neck restraints are strongly recommended.
15.9.6 Other
A.) No sharp or protruding edges in or around the cockpit, which would impede the driver’s rapid exit from the car.
B.) Windshield screens with a minimum of .090 inch screens must be securely fastened
C.) An electrical engine shut off switch is required. The switch must be clearly labeled and within the reach of the driver.
D.) A fuel shut off valve is required. The valve must clearly labeled and within reach of the driver.
E.) Flame retardant seat, roll bar, knee and steering pads or padding are recommended
15.10 – Roll Cage
A.) All cars must have a roll cage. The roll cage must be approved prior to competition and it must be welded to the frame. The driver’s head must not protrude above the top of the roll cage with the driver’s helmet on. The top of the roll cage must extend above the top of the driver’s helmet by a minimum of one (1) inch. The entire roll cage and all roll bar pieces must be fabricated from magnetic steel a minimum of .095” in thickness.
B.) The driver side door bars must be parallel to the ground and located perpendicular to the driver. The side bars must be welded to the front and rear of the roll cage. No brazing or soldering is permitted. The door bars must have a minimum thickness of .095” and must have a minimum of 1-1/2” diameter. On the driver’s side there will be a minimum of three (3) door bars.
C.) Foot protection is mandatory. One piece of magnetic steel tubing, a minimum .095” in thickness, must be fastened and/or welded across the back of the engine with vertical tubing a minimum of .095” thick.
D.) The door side roll bars are mandatory and must extend into the door panels.
E.) The roll cage must consist of continuous hoops that are no less than 1-1/2” in diameter and must a minimum thickness of .095”.
F.) The roll cage must be mounted securely (welded) to the frame in a minimum of 6 (six) places.
G.) The roll cage must consist of a configuration of front and rear hoops connected by tubing on the sides and/or side hoops. Roll cage must be securely supported and braced. Gussets to brace any portion of the roll cage will be permitted.
15.11 – Other
Section 15.11.1 – Electronic Devices & Traction Control
A.) All electronic and/or computerized wheel spin and/or acceleration retardation traction control devices will not be permitted. Controlled timing devices attached to or controlling accelerator or rotation of wheel will not be permitted.
B.) All traction control devices utilizing wheel sensors and/or any means of measuring ground speed to control wheel spin will not be permitted.
C.) Adjustable ping control devices, dial a chip controls, timing controls or automated throttle controls will not be permitted in cockpit or driver accessible areas.
D.) Adjustable restrictor plates will not be permitted.
E.) Any remotely controlled components inside or outside the cockpit of any competitor’s racecar will not be permitted.
F.) Radios or devices for transmitting voice or data will not be permitted, either in the racecar or on anyone connected with the car.
G.) The uses of pit boards or colored flashlights are prohibited
15.14 SERIES DECALS AND PATCHES
A.) All participants shall display required decals as provided on decal verification sheet to be allowed to compete.
B.). Series Decal on both side of the car is mandatory, Drivers series patch mandatory to receive point fund distribution.
C.). To receive any contingency sponsorship awards, team must meet the requirements of the award such as; decals, patches, product use, product verification.
talk about limited!! These are from Texas!! They have car counts of over 50...
2012 STS Limited Modified Rules
PREFACE: All equipment is subject to approval by South Texas Speedway track officials. Any alterations or modifications from
OEM (stock) not specifically allowed in these rules will be considered illegal. It is the racer’s responsibility to keep his/her car legal at
all times. Equipment having passed through inspection unobserved will not be considered as approved. South Texas Speedway
officials may assess weight penalties for cars and/or parts deemed as not in compliance with these rules. It is ultimately the obligation
of each participant to insure that their conduct and equipment comply with all applicable rules, as they may be amended from time to
time. No expressed or implied warranty of safety shall result from publication of, or compliance with these rules.
FRAME: 1978-1987 OEM midsize GM metric full frame only. Minimum wheelbase 107-inches,
maximum 109-inches, both sides. Frame must be full and complete, cannot be widened, narrowed, shortened, lengthened, or be cut,
bent, or altered to change suspension brackets, except upper control arm brackets on front end. All frame bolt holes must remain in
OEM location. Front frame horns may be removed in front of steering box. Front frame may be cut for radiator clearance. Frame may
be notched for seat clearance. Transmission crossmember mounts may be removed, no further forward than frame welds. Rear of
frame, behind upper shock mounts, may be replaced with round, square, or rectangular tubing. No part of frame can be lower than five
inches from ground except front crossmember. No other frame alterations allowed.
ROLL CAGE: Must consist of continuous hoops, minimum 1.5 inch O.D. tubing, with a minimum wall thickness of.095 inch for
main cage. Cages must be steel or chrome-moly. Main cage no further forward than rear of engine and no further back than front edge
of rear tire. Four bars, two per side, may extend from main roll cage to main frame points in front of the upper control arms. These
bars may have two additional braces per side to the main frame. Six bars may extend from the main cage to the rear. X-bracing is
allowed. Driver’s head must not protrude outside cage with helmet on. Roll cage must be securely supported and braced with
minimum one cross bar in top halo. All bars forward of cage must be lower than hood.
DOOR BARS: Minimum three driver side door bars required, minimum 1.5 inch O.D. and .083 inch wall thickness, must be parallel
to ground and perpendicular to driver, and welded to front and rear of roll cage. Minimum two passenger side door bars required, must
have at least one cross door bar, horizontal or angled. Steel door plate, 18 gauge or .049-inch.
BODY: Must be same width, front to rear, and parallel to OEM frame. Cooling holes allowed. Nose panel may be no wider than 2
inches outside of front frame horns and no lower than 4 inches. Nose fins are allowed no taller than 2.25”. Nose panel must remain
within confines of front bumper. Engine compartment must remain open (no side panels). Plastic nosepiece is allowed. Aluminum or
fiberglass hoods allowed must completely cover top of radiator and engine, extending from nose to interior deck and enclosed at rear.
Must have front and rear roof supports. Roof must be fiberglass or aluminum, full size and rounded down in all directions. No dished
roof allowed. Driver roof hatch allowed. No plastic body panels or filler panels allowed. Must have complete interior deck from side
to side, must be aluminum or sheet metal. Quarter panels must remain 90-degrees to ground, maximum 45-degree bend 4-inches from
bottom and 2-inches from top of doors and quarters. Rear spoiler may be maximum 8 inches in material height and maximum 67
inches wide. Spoiler may have stiffener, must be 1 inch or more down from top. Maximum 3 spoiler braces allowed, must be mounted
in line. Spoiler braces must resemble all aspects of drawing and must be separate from sail panels. No fins, lips or wings allowed.
DRIVER COMPARTMENT: Must have minimum three 5/16 inch O.D. windshield bars in front of
driver. Aluminum cowl panel in front of driver can be no wider than cockpit. Aluminum high-back seat only, must be securely bolted,
using minimum 0.375-inch bolts, to roll cage and support system. Floor pan must be metal or aluminum and cover entire driver
compartment. Bottom of seat can be no lower than bottom of frame rail. Driver must be sealed off from track, driveline, engine, fuel
cell, cannisters and pumps. No oil coolers allowed in driver compartment. No devices that would enable driver adjustment to alter
wheelbase or for weight jacking while car is in competition. No mirrors of any kind.
FRONT SUSPENSION: All components must be steel, unaltered OEM, in OEM location, and match frame. No jack bolts allowed.
Adjustable spring buckets are allowed. Must use OEM upper and lower A-frames and mounts. OEM upper A-frame may be replaced
using aftermarket upper A-frame (steel or aluminum cross shaft allowed). Upper A-frame mounts may be modified and moved for
caster and camber adjustment, but must remain OEM material. Lower A-frame mounts and bolt holes on frame must be in OEM
location, mount may be notched for clearance. All A-frame bushings may be aftermarket, but no OFFSET or bearing/heim type. ANY
STOCK ball joints allowed as long as you do not have to modify the a-frame to make it fit, may be tacked in. Sway bars(optional)
must remain mounted in original location both on the frame and the lower control arm, on the control arm side there is no shimming
allowed, must have 2 rubber bushings on the sway bar side, 2 rubber bushings on the a-arm side, the spacer between the a-arm and the
sway bar can be any length but must be of equal length. These are clarifications from IMCA.
STEERING: All components must be steel, unaltered OEM, in OEM location and match frame. No grinding, lightening or welding
on any steering parts. Spindle may be reamed and bolt on spindle savers are allowed. Steel steering shafts and knuckles only. Steering
quickener (optional), steering wheel and quick release (required) may be aluminum. Power steering pump and reservoir must remain
one unit. Driver compartment steering may be modified, must be kept on left side. No rack and pinion.
SHOCKS: One steel nonadjustable shock per wheel only. Shock must be in OEM mounts and location, using OEM style shock.
Mounting spacers and weld or screw-on shock ends allowed. No air or coil-over shocks, remote reservoir shocks, Schrader valves or
bladder type valve allowed.
SPRINGS: One steel spring (racing allowed) per wheel only. Minimum 4.5-inches O.D., nonprogressive
coils only. No torsion bars or air bags.
REAR SUSPENSION: All control arms and mounts must be steel, unaltered OEM, in OEM location, and match frame. No jack bolts
allowed. Adjustable spring buckets allowed, may be dropped as long as they remain in OEM location. If upper spring cup uses all
thread, it must be securely welded to chassis. Lower spring cups must be centered on housing. Control arms may be reinforced, but
cannot be shortened or lengthened, must remain OEM length. All control arm bushings may be aftermarket, but no bearing/heim type.
Bushings cannot be drilled. No suspension parts may be altered or lightened. No aluminum parts allowed, other than bushings.
REAR END: Must use OEM 7.5-inch GM 10 bolt rear end (bracing optional), must remain stock width. No Ford or floater rear end
allowed. Housing end, from control arm mount out, may be modified with 3-inch tubing to accept 9” Ford axle. If Ford axles are used,
rearend must remain minimum GM width or maximum 3-inches wider. Steel components only. OEM mounts on lower control arms
must remain in OEM location on original 7.5-inch tube housing. Aftermarket axles, mini-spools and C-clip eliminators allowed.
Locked rear ends only, no torque dividing differentials allowed. No full or aluminum spools allowed. Pinion angle can not be changed.
Any gear ratio allowed but housing must remain unaltered. No quick change devices.
BUMPERS/RUB RAILS: Steel only. Two bar front bumper and single bar rear bumper must be used on car at all times and welded,
or bolted securely using minimum 0.375 inch bolts. Must be maximum 1.50-inch O.D. tubing, .095-inch wall thickness on front and
1.75-inch tubing, .095 wall thickness on rear. Maximum 1.50-inch O.D. tubing, .095-inch wall thickness fuel cell protection bar
required, must cover rear and extend past both sides of cell, may be welded to rear bumper. See diagram for bumper heights. Rear
bumper may be maximum 6-inches beyond rear deck. All bumpers and rub rails must be capped with no sharp edges. Single bar rub
rail from front to rear wheel allowed on each side, no center supports allowed, maximum 1.50-inch O.D. tubing and .095-inch wall
thickness, must be mounted to cage at front and rear of rub rail.
TIRES/WHEELS: Must use unaltered Hoosier 500 and must be stamped either H500 or IMCA no
exceptions.(Track officials will have final decision on any tire). 27 by 8 by 15 or 26.5 by 8 by 15 ‘stagger tire’ allowed. No chemical
softening or conditioning allowed. Tires may be ground, siped, and grooved. Any offset allowed. Bead lock on right rear only.
External steel bead lock only and it cannot make wheel any narrower than 8-inches and no wider than 8.75-inches. Steel bolts only.
Outer foam or plastic mud cover allowed on right side wheels. Inner mud cover allowed on left rear only. No bleeder valves. Must use
minimum 1-inch O.D. lug nuts and 0.625-inch studs are recommended. No wheel spacers allowed with OEM studs. Wheel adapters
are treated as spacers and may be aluminum, maximum 1.50-inches thick.
BRAKES: Must be steel OEM, operative three wheel, drum or disc. Must maintain minimum OEM dimensions for hubs/rotors and
calipers, cannot be lightened. No oil bath hubs. Bolt pattern may be changed. 0.625-inch studs allowed. Single or dual aftermarket
master cylinders allowed. Driver adjustable dual pedal brake bias allowed. Additional proportioning valve (in-line type) allowed, must
be out of driver reach. Rear rotors may be aftermarket, minimum 0.810-inch thickness, maximum 12-inch O.D. Vented rotors only, no
scalloped, ceramic coated, single phase or drilled rotors allowed. Rear caliper brackets must be welded to housing.
EXHAUST: Any 1-5/8” tube header into a 3” collector allowed. Collector length maximum 9 inches. Turn Down length
maximum 10 inches. No header modifications allowed. Turn down allowed. Coated headers allowed. No exhaust sensors, merge
collectors, cross overs, no extensions or balance tubes.
FUEL SYSTEM Racing fuel cell required, maximum 22 gallon capacity (12 gallon recommended), must be in minimum 20 gauge
steel container. Must mount with minimum two solid steel straps around entire cell, two inches wide and 0.125 inch thick, between
frame rails and behind rear axle. Fuel cell vents, including cap vent, must have check valves. If fuel cell does not have aircraft style
positive seal filler neck/cap system – a flapper, spring or ball type filler rollover valve is required. No part of cell can be lower than
protective tubing. OEM mounted, mechanical push rod fuel pumps only. No regulators, bypass fuel systems, pressurized, or return
lines allowed. One fuel filter allowed. No cool cans. Any air cleaner allowed. No cold air boxes or ducting of any kind between engine
and hood. Mechanical OEM type push rod fuel pumps only. Maximum 0.100 inch thick carburetor gaskets on all engines.
NON-CRATE ENGINE:
Must use Holley(unaltered) #4412 or #0-80583-1, 500 cfm two barrel
must be used on any engine (float bowl must face forward). Any adapter allowed, maximum 1-inches thick. No throttle bore
adjustable carburetor spacers.
GM CRATE ENGINE: may use any Holley 4 barrel carburetor, all components (float bowls and main body) must be Holley
manufactured. Metering blocks and base plate may be billet aluminum non-Holley. No aerosol-style carburetors allowed. May use one
inch thick carburetor spacer, must use Moroso part #64940 with GM crate. Maximum 0.100 inch thick carburetor gaskets only.
FUEL: Gasoline only. Racing fuel allowed. No E85. No performance enhancing additives or scented additives. Fuel must pass both
dielectric meter and chemical tests. Fuel sample may be taken from any car at any time.
WEIGHT: Minimum weight limit of 2,350 pounds after race with driver in car. Weights must not be used in driver compartment or
outside body. All weights must be securely mounted and painted white with car number on it. No titanium, magnesium, stainless steel
or carbon fiber components. Solid steel fasteners only.
BATTERY/STARTER: One 12-volt battery only. Must be shielded and securely mounted. Aftermarket starter allowed, must bolt in
OEM location. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided, or
go to rear of that race.
GAUGES/ELECTRONICS: No unapproved cameras, transmitting or listening devices (exception is oneway RACEceiver radio by
officials), timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or
transmitting information except memory recall analog tach. 12 volt ignition system and OEM HEI style ignitions only. Ford/Chrysler
may use HEI distributor. No crank triggers. Any module that fits inside distributor with no alteration allowed. Crate engine MUST use
original HEI distributor with MSD #8728 rev-control and 6,200 rpm chip. Claim engine MAY use MSD #8728 rev-control with any
rpm chip. Rev-control must be out of reach of driver, but accessible for inspection. No ignition boxes, remote coil or accessories. All
wiring must be visible for inspection. OEM type alternator with internal regulator allowed. No electronic traction control
devices (Refer to www.imca.com for automatic penalties).
TRANSMISSION/DRIVE SHAFT: Only OEM production transmissions allowed. No aftermarket
transmissions allowed. No ‘in and out’ boxes or quick change devices allowed. With engine running and car in a still position, must be
able to engage car in gear and move forward, then backward. Functioning shift levers must be in OEM location. Transmission fluid
coolers allowed. Flywheel, flexplate and converter must be steel.
Automatic: Any OEM automatic transmission allowed. Must use functioning, minimum 10-inch diameter steel torque converter. No
direct drives, couplers, valved pumps, or bleeder style valve bodies. Must have at least one forward gear and reverse gear, gears must
function. Must have an approved scattershield constructed of .125-inch by three-inch steel, 270 degrees around top of flexplate. GM
automatic must be used with GM engine, may be used with Ford or Chrysler engine. Stall converters allowed. Steel OEM style
flexplate only, must be bolted directly to end of crankshaft.
Manual: 3, 4 or 5 speed OEM manual transmissions only. All gears must function. Must have functioning 10.5-inch minimum
diameter clutch and pressure plate bolted directly to steel flywheel. These components must rotate, consistant with engine rpm, while
car is in any gear. Must use explosion-proof steel bellhousing 180 degrees around top of clutch and flywheel. No mini-clutches or
couplers. Minimum 9-inch diameter Ford clutch allowed. Hydraulic slave cylinder/throw out bearing allowed.
Drive Shaft: Minimum 2-inch diameter, white, steel drive shaft only. Steel slip-yokes only. 360-degree drive shaft loop required,
constructed of at least 0.125-inch by 2-inch steel, or 1-inch tubing, mounted 6- inches back from front U-joint.
ENGINE COMPARTMENT: Rear of engine (bellhousing flange) must be mounted at least 70-inches forward from centerline of
rear axle. Minimum 11-inch engine height from ground to center of crankshaft. One radiator allowed, steel or aluminum, 27-inches by
19-inches maximum in size, must be mounted in front of engine. Racing cap and electric fans allowed. No sprinklers. Catch can
required. Power steering pump and reservoir must remain one unit and mount in front of engine. Side engine mounts only (OEM or
45-degree style) must be steel, aluminum mid-plate allowed. No vacuum pumps or pan evac systems.
ENGINE OPTIONS AND SPECIFICATIONS: All cars must clearly display on driver side front roof post which engine they are
competing with. Must be contrasting in color from body, minimum 2-inches tall and display CLAIM or CRATE. Markers not
acceptable.
(A) CRATE ENGINE: Must use unaltered sealed GM #88958602 or #19258602 crate engine. Upon inspection, any different,
altered or missing GM seal bolts will result in disqualification, loss of all points and money. GM seal bolt exception is IMCA
approved and issued cable-lock rebuild system, and oil pan may be replaced by IMCA certified builder with Kevko pan
#1090NRHw/ISP and Kevko pick-up #1003-3/4. Disqualification for any crate engine not using required spacer, distributor,
rev limiter, pushrods, valve springs or rocker arms.
ENGINE SPECIFICATIONS: All engines must be able to be used in conventional passenger car without alterations. External
engine casting and threaded holes cannot be altered. No aluminum, titanium or carbon fiber components allowed.
BLOCK: Must use OEM steel passenger vehicle production block only. No GM bowtie, Ford SVO or Chrysler W-2 components
allowed. Approved blocks are: GM (Chevy only): 283, 302, 305, 307, 327, 350. Ford: 260, 289, 302, 351. Chrysler: 273, 318, 340,
360, no hemis. Maximum cubic inch limits: GM 364, Ford 360, Chrysler 370, no tolerance. No 400 or larger cubic inch parts allowed.
Any flat top or dished pistons allowed, no gas ported pistons. 3.48-inch maximum GM stroke. Maximum 175 lbs. per cylinder
compression, no tolerance. Compression checked with one spark plug removed, turned five engine compression revolutions. Engines
may be balanced and block decked. Oil filter system must remain OEM. ‘Wet’ sump oiling system only. No accumulators. OEM or
OEM replacement steel crankshaft only – cannot be lightened (no aeroing, bullnose, knife edge, undercut or drilling of second or third
rod throws allowed. OEM, or OEM replacement steel rods only - GM must use maximum 5.7-inch rod. No cap screws. No splayed
main caps. Racing oil pans allowed. (One inch inspection hole recommended in pan will be required in 2011). No obstructions to
crank and rods. If obstructions are present, must remove pan for inspection. Engine bolts may be aftermarket. Fluid dampener balancer
allowed. No roller bearings allowed.
CYLINDER HEADS: Only GM OEM approved head numbers are (last 3 digits): 126, 185, 336, 441, 445, 487, 493, 598, 624, 862,
882, 920, 993, 997, with valve no larger than 1.94-inch intake and 1.50-inch exhaust. May use Engine Quest (EQ) Stock Replacement
(SR) cylinder head, GM part number CH350I, Chrysler part number CH318B, head must remain as produced, seat angles and valve
sizes can not be changed; three angle valve job only (absolutely no casting removal in valve pocket of EQ heads for any reason). valve
sizes can not be changed. No porting, polishing, or unapproved alterations to ANY cylinder head. Any cast iron OEM Ford and
Chrysler heads allowed with valves no larger than 2.04-inch intake and 1.70-inch exhaust. Headers must bolt directly to heads with
correct numbers. No vortec, bowtie, SVO, W-2 or aftermarket heads allowed. Flat milling allowed. Guide plates, screw-in shouldered
studs (0.375-inch max) and polylocks allowed. No stud girdles. Steel roller tip rocker arms allowed. Chrysler may use OEM rocker
arm bars. Any length push rods allowed. OEM diameter springs (GM –1.250 inch maximum O.D.) must match heads. No beehive
valve springs allowed.
INTAKE: Unaltered, approved OEM cast iron low rise, two- or four-barrel. Only unaltered aftermarket aluminum intakes allowed
are: Weiand GM #7547-1; Ford #7515, #8023 or #7516; Chrysler #7545, 8022; Edelbrock GM #2701; Ford #7121, #7181, #7183;
Chrysler #2915. No porting, polishing, or plenum alterations to ANY intake. Cooling lines allowed on aluminum intakes. No OEM hirise,
marine or bowtie intakes. Ford may use OEM aluminum intake, no under air or hi-rise. All intakes must have unobstructed 0.250-
inch vacuum fitting. Belt driven, OEM style water pumps only, no aluminum water pumps on Chevy engine.
CAMSHAFT: Conventional flat tappet cam and lifters allowed. OEM firing order cannot be changed (GM 1-8-4-3-6-5-7-2). No
maximum cam lift. No Vacuum rule. Must be chain driven, no gear/belt drives.
OFFICIAL RULINGS: Officials reserve the right to make final decisions in the interpretation of any rules or race procedures at any
time. No equipment will be considered as having been approved by reason of having passed through inspection unobserved.
If you have any questions regarding the rules set forth, contact Owen Pittman at 361-548-0669.
We reserve the right to make adjustments in total car weight.
Raceceiver’s are required in the Lone Star Welding Limited Modified Division.
2012 STS Limited Modified Rules
PREFACE: All equipment is subject to approval by South Texas Speedway track officials. Any alterations or modifications from
OEM (stock) not specifically allowed in these rules will be considered illegal. It is the racer’s responsibility to keep his/her car legal at
all times. Equipment having passed through inspection unobserved will not be considered as approved. South Texas Speedway
officials may assess weight penalties for cars and/or parts deemed as not in compliance with these rules. It is ultimately the obligation
of each participant to insure that their conduct and equipment comply with all applicable rules, as they may be amended from time to
time. No expressed or implied warranty of safety shall result from publication of, or compliance with these rules.
FRAME: 1978-1987 OEM midsize GM metric full frame only. Minimum wheelbase 107-inches,
maximum 109-inches, both sides. Frame must be full and complete, cannot be widened, narrowed, shortened, lengthened, or be cut,
bent, or altered to change suspension brackets, except upper control arm brackets on front end. All frame bolt holes must remain in
OEM location. Front frame horns may be removed in front of steering box. Front frame may be cut for radiator clearance. Frame may
be notched for seat clearance. Transmission crossmember mounts may be removed, no further forward than frame welds. Rear of
frame, behind upper shock mounts, may be replaced with round, square, or rectangular tubing. No part of frame can be lower than five
inches from ground except front crossmember. No other frame alterations allowed.
ROLL CAGE: Must consist of continuous hoops, minimum 1.5 inch O.D. tubing, with a minimum wall thickness of.095 inch for
main cage. Cages must be steel or chrome-moly. Main cage no further forward than rear of engine and no further back than front edge
of rear tire. Four bars, two per side, may extend from main roll cage to main frame points in front of the upper control arms. These
bars may have two additional braces per side to the main frame. Six bars may extend from the main cage to the rear. X-bracing is
allowed. Driver’s head must not protrude outside cage with helmet on. Roll cage must be securely supported and braced with
minimum one cross bar in top halo. All bars forward of cage must be lower than hood.
DOOR BARS: Minimum three driver side door bars required, minimum 1.5 inch O.D. and .083 inch wall thickness, must be parallel
to ground and perpendicular to driver, and welded to front and rear of roll cage. Minimum two passenger side door bars required, must
have at least one cross door bar, horizontal or angled. Steel door plate, 18 gauge or .049-inch.
BODY: Must be same width, front to rear, and parallel to OEM frame. Cooling holes allowed. Nose panel may be no wider than 2
inches outside of front frame horns and no lower than 4 inches. Nose fins are allowed no taller than 2.25”. Nose panel must remain
within confines of front bumper. Engine compartment must remain open (no side panels). Plastic nosepiece is allowed. Aluminum or
fiberglass hoods allowed must completely cover top of radiator and engine, extending from nose to interior deck and enclosed at rear.
Must have front and rear roof supports. Roof must be fiberglass or aluminum, full size and rounded down in all directions. No dished
roof allowed. Driver roof hatch allowed. No plastic body panels or filler panels allowed. Must have complete interior deck from side
to side, must be aluminum or sheet metal. Quarter panels must remain 90-degrees to ground, maximum 45-degree bend 4-inches from
bottom and 2-inches from top of doors and quarters. Rear spoiler may be maximum 8 inches in material height and maximum 67
inches wide. Spoiler may have stiffener, must be 1 inch or more down from top. Maximum 3 spoiler braces allowed, must be mounted
in line. Spoiler braces must resemble all aspects of drawing and must be separate from sail panels. No fins, lips or wings allowed.
DRIVER COMPARTMENT: Must have minimum three 5/16 inch O.D. windshield bars in front of
driver. Aluminum cowl panel in front of driver can be no wider than cockpit. Aluminum high-back seat only, must be securely bolted,
using minimum 0.375-inch bolts, to roll cage and support system. Floor pan must be metal or aluminum and cover entire driver
compartment. Bottom of seat can be no lower than bottom of frame rail. Driver must be sealed off from track, driveline, engine, fuel
cell, cannisters and pumps. No oil coolers allowed in driver compartment. No devices that would enable driver adjustment to alter
wheelbase or for weight jacking while car is in competition. No mirrors of any kind.
FRONT SUSPENSION: All components must be steel, unaltered OEM, in OEM location, and match frame. No jack bolts allowed.
Adjustable spring buckets are allowed. Must use OEM upper and lower A-frames and mounts. OEM upper A-frame may be replaced
using aftermarket upper A-frame (steel or aluminum cross shaft allowed). Upper A-frame mounts may be modified and moved for
caster and camber adjustment, but must remain OEM material. Lower A-frame mounts and bolt holes on frame must be in OEM
location, mount may be notched for clearance. All A-frame bushings may be aftermarket, but no OFFSET or bearing/heim type. ANY
STOCK ball joints allowed as long as you do not have to modify the a-frame to make it fit, may be tacked in. Sway bars(optional)
must remain mounted in original location both on the frame and the lower control arm, on the control arm side there is no shimming
allowed, must have 2 rubber bushings on the sway bar side, 2 rubber bushings on the a-arm side, the spacer between the a-arm and the
sway bar can be any length but must be of equal length. These are clarifications from IMCA.
STEERING: All components must be steel, unaltered OEM, in OEM location and match frame. No grinding, lightening or welding
on any steering parts. Spindle may be reamed and bolt on spindle savers are allowed. Steel steering shafts and knuckles only. Steering
quickener (optional), steering wheel and quick release (required) may be aluminum. Power steering pump and reservoir must remain
one unit. Driver compartment steering may be modified, must be kept on left side. No rack and pinion.
SHOCKS: One steel nonadjustable shock per wheel only. Shock must be in OEM mounts and location, using OEM style shock.
Mounting spacers and weld or screw-on shock ends allowed. No air or coil-over shocks, remote reservoir shocks, Schrader valves or
bladder type valve allowed.
SPRINGS: One steel spring (racing allowed) per wheel only. Minimum 4.5-inches O.D., nonprogressive
coils only. No torsion bars or air bags.
REAR SUSPENSION: All control arms and mounts must be steel, unaltered OEM, in OEM location, and match frame. No jack bolts
allowed. Adjustable spring buckets allowed, may be dropped as long as they remain in OEM location. If upper spring cup uses all
thread, it must be securely welded to chassis. Lower spring cups must be centered on housing. Control arms may be reinforced, but
cannot be shortened or lengthened, must remain OEM length. All control arm bushings may be aftermarket, but no bearing/heim type.
Bushings cannot be drilled. No suspension parts may be altered or lightened. No aluminum parts allowed, other than bushings.
REAR END: Must use OEM 7.5-inch GM 10 bolt rear end (bracing optional), must remain stock width. No Ford or floater rear end
allowed. Housing end, from control arm mount out, may be modified with 3-inch tubing to accept 9” Ford axle. If Ford axles are used,
rearend must remain minimum GM width or maximum 3-inches wider. Steel components only. OEM mounts on lower control arms
must remain in OEM location on original 7.5-inch tube housing. Aftermarket axles, mini-spools and C-clip eliminators allowed.
Locked rear ends only, no torque dividing differentials allowed. No full or aluminum spools allowed. Pinion angle can not be changed.
Any gear ratio allowed but housing must remain unaltered. No quick change devices.
BUMPERS/RUB RAILS: Steel only. Two bar front bumper and single bar rear bumper must be used on car at all times and welded,
or bolted securely using minimum 0.375 inch bolts. Must be maximum 1.50-inch O.D. tubing, .095-inch wall thickness on front and
1.75-inch tubing, .095 wall thickness on rear. Maximum 1.50-inch O.D. tubing, .095-inch wall thickness fuel cell protection bar
required, must cover rear and extend past both sides of cell, may be welded to rear bumper. See diagram for bumper heights. Rear
bumper may be maximum 6-inches beyond rear deck. All bumpers and rub rails must be capped with no sharp edges. Single bar rub
rail from front to rear wheel allowed on each side, no center supports allowed, maximum 1.50-inch O.D. tubing and .095-inch wall
thickness, must be mounted to cage at front and rear of rub rail.
TIRES/WHEELS: Must use unaltered Hoosier 500 and must be stamped either H500 or IMCA no
exceptions.(Track officials will have final decision on any tire). 27 by 8 by 15 or 26.5 by 8 by 15 ‘stagger tire’ allowed. No chemical
softening or conditioning allowed. Tires may be ground, siped, and grooved. Any offset allowed. Bead lock on right rear only.
External steel bead lock only and it cannot make wheel any narrower than 8-inches and no wider than 8.75-inches. Steel bolts only.
Outer foam or plastic mud cover allowed on right side wheels. Inner mud cover allowed on left rear only. No bleeder valves. Must use
minimum 1-inch O.D. lug nuts and 0.625-inch studs are recommended. No wheel spacers allowed with OEM studs. Wheel adapters
are treated as spacers and may be aluminum, maximum 1.50-inches thick.
BRAKES: Must be steel OEM, operative three wheel, drum or disc. Must maintain minimum OEM dimensions for hubs/rotors and
calipers, cannot be lightened. No oil bath hubs. Bolt pattern may be changed. 0.625-inch studs allowed. Single or dual aftermarket
master cylinders allowed. Driver adjustable dual pedal brake bias allowed. Additional proportioning valve (in-line type) allowed, must
be out of driver reach. Rear rotors may be aftermarket, minimum 0.810-inch thickness, maximum 12-inch O.D. Vented rotors only, no
scalloped, ceramic coated, single phase or drilled rotors allowed. Rear caliper brackets must be welded to housing.
EXHAUST: Any 1-5/8” tube header into a 3” collector allowed. Collector length maximum 9 inches. Turn Down length
maximum 10 inches. No header modifications allowed. Turn down allowed. Coated headers allowed. No exhaust sensors, merge
collectors, cross overs, no extensions or balance tubes.
FUEL SYSTEM Racing fuel cell required, maximum 22 gallon capacity (12 gallon recommended), must be in minimum 20 gauge
steel container. Must mount with minimum two solid steel straps around entire cell, two inches wide and 0.125 inch thick, between
frame rails and behind rear axle. Fuel cell vents, including cap vent, must have check valves. If fuel cell does not have aircraft style
positive seal filler neck/cap system – a flapper, spring or ball type filler rollover valve is required. No part of cell can be lower than
protective tubing. OEM mounted, mechanical push rod fuel pumps only. No regulators, bypass fuel systems, pressurized, or return
lines allowed. One fuel filter allowed. No cool cans. Any air cleaner allowed. No cold air boxes or ducting of any kind between engine
and hood. Mechanical OEM type push rod fuel pumps only. Maximum 0.100 inch thick carburetor gaskets on all engines.
NON-CRATE ENGINE:
Must use Holley(unaltered) #4412 or #0-80583-1, 500 cfm two barrel
must be used on any engine (float bowl must face forward). Any adapter allowed, maximum 1-inches thick. No throttle bore
adjustable carburetor spacers.
GM CRATE ENGINE: may use any Holley 4 barrel carburetor, all components (float bowls and main body) must be Holley
manufactured. Metering blocks and base plate may be billet aluminum non-Holley. No aerosol-style carburetors allowed. May use one
inch thick carburetor spacer, must use Moroso part #64940 with GM crate. Maximum 0.100 inch thick carburetor gaskets only.
FUEL: Gasoline only. Racing fuel allowed. No E85. No performance enhancing additives or scented additives. Fuel must pass both
dielectric meter and chemical tests. Fuel sample may be taken from any car at any time.
WEIGHT: Minimum weight limit of 2,350 pounds after race with driver in car. Weights must not be used in driver compartment or
outside body. All weights must be securely mounted and painted white with car number on it. No titanium, magnesium, stainless steel
or carbon fiber components. Solid steel fasteners only.
BATTERY/STARTER: One 12-volt battery only. Must be shielded and securely mounted. Aftermarket starter allowed, must bolt in
OEM location. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided, or
go to rear of that race.
GAUGES/ELECTRONICS: No unapproved cameras, transmitting or listening devices (exception is oneway RACEceiver radio by
officials), timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or
transmitting information except memory recall analog tach. 12 volt ignition system and OEM HEI style ignitions only. Ford/Chrysler
may use HEI distributor. No crank triggers. Any module that fits inside distributor with no alteration allowed. Crate engine MUST use
original HEI distributor with MSD #8728 rev-control and 6,200 rpm chip. Claim engine MAY use MSD #8728 rev-control with any
rpm chip. Rev-control must be out of reach of driver, but accessible for inspection. No ignition boxes, remote coil or accessories. All
wiring must be visible for inspection. OEM type alternator with internal regulator allowed. No electronic traction control
devices (Refer to www.imca.com for automatic penalties).
TRANSMISSION/DRIVE SHAFT: Only OEM production transmissions allowed. No aftermarket
transmissions allowed. No ‘in and out’ boxes or quick change devices allowed. With engine running and car in a still position, must be
able to engage car in gear and move forward, then backward. Functioning shift levers must be in OEM location. Transmission fluid
coolers allowed. Flywheel, flexplate and converter must be steel.
Automatic: Any OEM automatic transmission allowed. Must use functioning, minimum 10-inch diameter steel torque converter. No
direct drives, couplers, valved pumps, or bleeder style valve bodies. Must have at least one forward gear and reverse gear, gears must
function. Must have an approved scattershield constructed of .125-inch by three-inch steel, 270 degrees around top of flexplate. GM
automatic must be used with GM engine, may be used with Ford or Chrysler engine. Stall converters allowed. Steel OEM style
flexplate only, must be bolted directly to end of crankshaft.
Manual: 3, 4 or 5 speed OEM manual transmissions only. All gears must function. Must have functioning 10.5-inch minimum
diameter clutch and pressure plate bolted directly to steel flywheel. These components must rotate, consistant with engine rpm, while
car is in any gear. Must use explosion-proof steel bellhousing 180 degrees around top of clutch and flywheel. No mini-clutches or
couplers. Minimum 9-inch diameter Ford clutch allowed. Hydraulic slave cylinder/throw out bearing allowed.
Drive Shaft: Minimum 2-inch diameter, white, steel drive shaft only. Steel slip-yokes only. 360-degree drive shaft loop required,
constructed of at least 0.125-inch by 2-inch steel, or 1-inch tubing, mounted 6- inches back from front U-joint.
ENGINE COMPARTMENT: Rear of engine (bellhousing flange) must be mounted at least 70-inches forward from centerline of
rear axle. Minimum 11-inch engine height from ground to center of crankshaft. One radiator allowed, steel or aluminum, 27-inches by
19-inches maximum in size, must be mounted in front of engine. Racing cap and electric fans allowed. No sprinklers. Catch can
required. Power steering pump and reservoir must remain one unit and mount in front of engine. Side engine mounts only (OEM or
45-degree style) must be steel, aluminum mid-plate allowed. No vacuum pumps or pan evac systems.
ENGINE OPTIONS AND SPECIFICATIONS: All cars must clearly display on driver side front roof post which engine they are
competing with. Must be contrasting in color from body, minimum 2-inches tall and display CLAIM or CRATE. Markers not
acceptable.
(A) CRATE ENGINE: Must use unaltered sealed GM #88958602 or #19258602 crate engine. Upon inspection, any different,
altered or missing GM seal bolts will result in disqualification, loss of all points and money. GM seal bolt exception is IMCA
approved and issued cable-lock rebuild system, and oil pan may be replaced by IMCA certified builder with Kevko pan
#1090NRHw/ISP and Kevko pick-up #1003-3/4. Disqualification for any crate engine not using required spacer, distributor,
rev limiter, pushrods, valve springs or rocker arms.
ENGINE SPECIFICATIONS: All engines must be able to be used in conventional passenger car without alterations. External
engine casting and threaded holes cannot be altered. No aluminum, titanium or carbon fiber components allowed.
BLOCK: Must use OEM steel passenger vehicle production block only. No GM bowtie, Ford SVO or Chrysler W-2 components
allowed. Approved blocks are: GM (Chevy only): 283, 302, 305, 307, 327, 350. Ford: 260, 289, 302, 351. Chrysler: 273, 318, 340,
360, no hemis. Maximum cubic inch limits: GM 364, Ford 360, Chrysler 370, no tolerance. No 400 or larger cubic inch parts allowed.
Any flat top or dished pistons allowed, no gas ported pistons. 3.48-inch maximum GM stroke. Maximum 175 lbs. per cylinder
compression, no tolerance. Compression checked with one spark plug removed, turned five engine compression revolutions. Engines
may be balanced and block decked. Oil filter system must remain OEM. ‘Wet’ sump oiling system only. No accumulators. OEM or
OEM replacement steel crankshaft only – cannot be lightened (no aeroing, bullnose, knife edge, undercut or drilling of second or third
rod throws allowed. OEM, or OEM replacement steel rods only - GM must use maximum 5.7-inch rod. No cap screws. No splayed
main caps. Racing oil pans allowed. (One inch inspection hole recommended in pan will be required in 2011). No obstructions to
crank and rods. If obstructions are present, must remove pan for inspection. Engine bolts may be aftermarket. Fluid dampener balancer
allowed. No roller bearings allowed.
CYLINDER HEADS: Only GM OEM approved head numbers are (last 3 digits): 126, 185, 336, 441, 445, 487, 493, 598, 624, 862,
882, 920, 993, 997, with valve no larger than 1.94-inch intake and 1.50-inch exhaust. May use Engine Quest (EQ) Stock Replacement
(SR) cylinder head, GM part number CH350I, Chrysler part number CH318B, head must remain as produced, seat angles and valve
sizes can not be changed; three angle valve job only (absolutely no casting removal in valve pocket of EQ heads for any reason). valve
sizes can not be changed. No porting, polishing, or unapproved alterations to ANY cylinder head. Any cast iron OEM Ford and
Chrysler heads allowed with valves no larger than 2.04-inch intake and 1.70-inch exhaust. Headers must bolt directly to heads with
correct numbers. No vortec, bowtie, SVO, W-2 or aftermarket heads allowed. Flat milling allowed. Guide plates, screw-in shouldered
studs (0.375-inch max) and polylocks allowed. No stud girdles. Steel roller tip rocker arms allowed. Chrysler may use OEM rocker
arm bars. Any length push rods allowed. OEM diameter springs (GM –1.250 inch maximum O.D.) must match heads. No beehive
valve springs allowed.
INTAKE: Unaltered, approved OEM cast iron low rise, two- or four-barrel. Only unaltered aftermarket aluminum intakes allowed
are: Weiand GM #7547-1; Ford #7515, #8023 or #7516; Chrysler #7545, 8022; Edelbrock GM #2701; Ford #7121, #7181, #7183;
Chrysler #2915. No porting, polishing, or plenum alterations to ANY intake. Cooling lines allowed on aluminum intakes. No OEM hirise,
marine or bowtie intakes. Ford may use OEM aluminum intake, no under air or hi-rise. All intakes must have unobstructed 0.250-
inch vacuum fitting. Belt driven, OEM style water pumps only, no aluminum water pumps on Chevy engine.
CAMSHAFT: Conventional flat tappet cam and lifters allowed. OEM firing order cannot be changed (GM 1-8-4-3-6-5-7-2). No
maximum cam lift. No Vacuum rule. Must be chain driven, no gear/belt drives.
OFFICIAL RULINGS: Officials reserve the right to make final decisions in the interpretation of any rules or race procedures at any
time. No equipment will be considered as having been approved by reason of having passed through inspection unobserved.
If you have any questions regarding the rules set forth, contact Owen Pittman at 361-548-0669.
We reserve the right to make adjustments in total car weight.
Raceceiver’s are required in the Lone Star Welding Limited Modified Division.
WHat about going with an IMCA sanction? Instead of just hijacking and twisting on their rules, go all the way with them and sanction. They are after all the ones that everybody bases off of anyway, and what they are doing seems to work. The IMCA mods are more affordable than UMP and you can still race for national points.
Most tracks around here do not want to be the first to step out and try something different, but if it works they will join in. After all, Fredericktown was the 1st in the area to bring in the pure streets and b mods and those classes are staples at the local tracks now.
Most tracks around here do not want to be the first to step out and try something different, but if it works they will join in. After all, Fredericktown was the 1st in the area to bring in the pure streets and b mods and those classes are staples at the local tracks now.
Mindblower1991
Member
As for the B-mod rules, not everyone agrees on the Farmington/Doe Run rules but Farmington's been getting at least 20 cars every night with these rules. Why would a track less than 30 miles away go up against the rules at another track? You'd be hurting yourself and racing in the area. If you went with Malden rules how many Malden guys would tow to the Rock every week?
COBRAII
Active Member
First of all, if they go with Farmington/Doe Run rules they are competing against 1 of said tracks on SAME night for SAME class of cars. This is a combination that will hurt both tracks. I say do not run anything that the other Friday night track does.
In 1998, we brought Malden rule pure streets to Fredrock, there were none of those cars in the area, but it was a good class and people saw that and the class grew rapidly. In 2005 or 06, dont remember for sure, we brought Malden rule B-mods to Fredrock, again there were none in the area. We started the year with 6 and by the end of the 1st year there were 16-18 on a regular basis. That class evolved to what you are currently racing in.
Things need to be changed up once in a while as racing evolves. I see Fredrock having to start from scratch as being the perfect oppurtunity to start something different.
1 thing is fact, no matter what the rules or classes, not everyone will agree.
In 1998, we brought Malden rule pure streets to Fredrock, there were none of those cars in the area, but it was a good class and people saw that and the class grew rapidly. In 2005 or 06, dont remember for sure, we brought Malden rule B-mods to Fredrock, again there were none in the area. We started the year with 6 and by the end of the 1st year there were 16-18 on a regular basis. That class evolved to what you are currently racing in.
Things need to be changed up once in a while as racing evolves. I see Fredrock having to start from scratch as being the perfect oppurtunity to start something different.
1 thing is fact, no matter what the rules or classes, not everyone will agree.
Mindblower1991
Member
yeah i agree with you on it being a bad idea to go against Doe Run on a Friday night, but a late Sunday afternoon program would work perfect for Farmington/Doe Run B-mods and possibly all classes involved. If Fredrock does decide to run something different, I wish it nothing but the best.
racingirl2
New Member
I am just excited to hear you will be opening the track once again, i know several modified and pure street drivers that would love to race that track again. But i think it would be great to keep the pure streets the same as they run in farmington and doe run, (meaning not bone stock) just for the simple fact that it would be easier for drivers that run either place to come down versus having to change their cars around just to run in fredericktown, drivers like to have options when it comes to race tracks and if you make a class that only a certain type of car can run it limits their options. and with the economy it wont pay off to have to make drivers build a car that is just for one track.If you keep them the same a simple gear change can make cars versatile without excluding cars. and as far as modified go its a small enough track that you can run A & B mods in one class as they did before.
short-edout96
Adam Short
Run on Sunday there no sense in trying compete with another track! When this has not worked in years past!! Don't be a selfish and think about others and maybe Fred Rock will stand the test of time! This time around!!
Just got off the phone with Terry Flanagan.. Chance of a meeting the first week of November.. Thats tenative now, because he has to get with his tech man, Curley, Ann, and Arlin to make decisions, and you know how things never go as well as you want them to on your schedule....So thats why the meeting is tenative.. Terry will post here when a decision has been reached.. thanks for the support, and there is a FB page listed under Fredericktown raceway.. Like and post opinions and suggestions!! Thanks...
Justin.. That is a great idea..The Lions rodeo grounds has been having a good crowd of people and racing mowers this summer..They are always a hit at the Fair! It would be a shot in the foot NOT to run them 2 times a month.. Much better than carts! Where you will only get 6... 20 to 30 mowers is a better field!
