Lifetime Premium Member
Join Date: Aug 2004
Location: Nanimo, B.C. Canada
I checked my AFR 315's (after the machine shop checked them) with the valve train set up. Minimum distance was on the exhaust damper springs, had 0.80 minimum clearance with a .702 lift cam. The inner and outer springs had a lot more, about .125" min.
As usual, Mike is dead on with the springs. My 315's did have one shim under each spring, I think it was 0.015", only lowerewd the spring pressure a little over 5lbs. You WILL have to change the springs, I checked with Comp before deciding to go with a billet roller. Their street roller wont handle the AFR spring pressures.