if the cylinder pressure IS 170psi and assuming the test and gauge are correct then the engine doesn't have 10.25:1 with a short cam. that would be more like 9:1 with a stock cam. you can't have it both ways. something just doesn't add up here. i have a basically stock 440 with 9,3:1 compression and a mopar 272/.455 that will blow 180,... confused. If the engine IS the lower compression stock type cam build, then that sets up for a different solution to the problem. assuming the balancer TDC mark is correct then i'd say contaminants in the intake charge.

i have to wonder if the pistons are L2266 with a short cam? .120+ quench distance with a .039" gasket.

Last edited by lewtot184; 12/02/21 09:23 AM.