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Ok..the shroud...you want to go to the edge of the fan...any closer to the motor...it will actually hurt you. Id jet her up...72's i know is lean...no matter what. I would get an asst of jets from a parts house..id start with 82's(i usally run 86-88's) but i run a 550 lift cam and 11to 1 pistons. 500 degrees..sounds little high..probably due to lean. Try that..let us know.MC64 said:I enlarged hole to 1 1/4. plugs are burning clean. running stock 4412 jets, 72 i beleive. Aluminuim pulley and 6 fin racing fan. I am going to changes all my guages today because they are all old. We are making a new shroud also because fan is only inside about 1/2" and it has alot of gaps and small holes in it. I borrowed infared temp at track and temp on headers was almost 500 on all cylinders.