I recently bought a Mopar Performance pre-magnum short block. I am using a set of rebuilt stock 1976 heads with stock valves and stock 1.5 rockers. I put the MP .430 int/.450 ext. cam in there with the exact valve springs and everything that MP recommends to be installed with this cam. The problem is that the Mopar Engines book lists this spring as having a 1.18 soild height and on my engine (and any stock engine) the exhaust valves are going to reach 1.20 and the intake 1.22 with this setup. The Mopar Engines book state that you should have at least 0.10 distance between the solid height of the spring and max valve lift and I am only left with 0.04 int and 0.02 exhaust (installed spring height varies from 1.65-1.67) and this is with using the recomended parts from Mopar. Can anyone shed some light on to this?
TIA, Brett