Pro 4 Class Rules
1. Any car or truck with a single or dual cam 4 cylinder engine may be run.It must be completely
stock as manufactured, engine, drive train, and suspension and fuel system, except as noted
below. No Turbo’s, No Rear or Mid Engine Vehicles
2.All glass, mirrors, body molding and trim must be removed. All insulation and any other
combustible ...material must be removed. Steering and pedals must remain stock. Dash may be
modified for roll cage clearance.
3.A box type 6 point roll cage of 1 1/2" x .095 wall minimum steel tubing is required. Roll cage
legs must be welded to 1/8" plates, 4"x8" minimum size. Truck frames may use a 2"x3" tubing to
construct a perimeter frame to attach roll cage and door bars. Doors on both sides must have 3
bars, 1 1/2" x .095 minimum. Passenger side may be an “X” but must have 3 bars. The roll cage
must be a box over, behind and in front of driver. The hoop behind the driver must have a
diagonal brace. Roof loop must have a center bar. Extra bracing inside the cockpit is allowed.
4.Doors must be welded or chained shut. Windshield must be replaced with heavy gauge wire
mesh. 3 bars of 3/8" diameter must be welded to the roll cage in front of driver.
5.Strut towers may be reinforced. Right front hubs may be reinforced. Wheel centers may be
reinforced. Larger wheel studs and nuts are recommended.
6.Passenger car tires only, no low profile tires. Minimum inflation for all tires shall be the
maximum as determined bu the manufacturer and stated on tire. If tire has no stated maximum, it
may not be run.
7.Fuel cell in steel can, or steel tank may be securely mounted in trunk. It must have a firewall
between the tank and driver. Must meet the safety man’s approval.
8.Battery must be securely fastened down, if in cockpit it must be completely enclosed. Must run
battery master disconnect switch with in reach of driver. Third brake light must remain operable.
9.Racing seat mandatory. A quick release 5 point racing type seat belt is required. Seat and seat
belts must mount to frame or roll cage, and meet safety man’s approval.
10.All cars must have a window net. Must wear approved helmet and fire suit.
11.Must have a registered number 18" tall in contrasting colors on both doors and on roof facing
the drivers side. Driver’s full name MUST appear on both sides or the roof above the doors. A 6"
white number on black background.
1. Any car or truck with a single or dual cam 4 cylinder engine may be run.It must be completely
stock as manufactured, engine, drive train, and suspension and fuel system, except as noted
below. No Turbo’s, No Rear or Mid Engine Vehicles
2.All glass, mirrors, body molding and trim must be removed. All insulation and any other
combustible ...material must be removed. Steering and pedals must remain stock. Dash may be
modified for roll cage clearance.
3.A box type 6 point roll cage of 1 1/2" x .095 wall minimum steel tubing is required. Roll cage
legs must be welded to 1/8" plates, 4"x8" minimum size. Truck frames may use a 2"x3" tubing to
construct a perimeter frame to attach roll cage and door bars. Doors on both sides must have 3
bars, 1 1/2" x .095 minimum. Passenger side may be an “X” but must have 3 bars. The roll cage
must be a box over, behind and in front of driver. The hoop behind the driver must have a
diagonal brace. Roof loop must have a center bar. Extra bracing inside the cockpit is allowed.
4.Doors must be welded or chained shut. Windshield must be replaced with heavy gauge wire
mesh. 3 bars of 3/8" diameter must be welded to the roll cage in front of driver.
5.Strut towers may be reinforced. Right front hubs may be reinforced. Wheel centers may be
reinforced. Larger wheel studs and nuts are recommended.
6.Passenger car tires only, no low profile tires. Minimum inflation for all tires shall be the
maximum as determined bu the manufacturer and stated on tire. If tire has no stated maximum, it
may not be run.
7.Fuel cell in steel can, or steel tank may be securely mounted in trunk. It must have a firewall
between the tank and driver. Must meet the safety man’s approval.
8.Battery must be securely fastened down, if in cockpit it must be completely enclosed. Must run
battery master disconnect switch with in reach of driver. Third brake light must remain operable.
9.Racing seat mandatory. A quick release 5 point racing type seat belt is required. Seat and seat
belts must mount to frame or roll cage, and meet safety man’s approval.
10.All cars must have a window net. Must wear approved helmet and fire suit.
11.Must have a registered number 18" tall in contrasting colors on both doors and on roof facing
the drivers side. Driver’s full name MUST appear on both sides or the roof above the doors. A 6"
white number on black background.
