wills30

which is a better cam bank for a all out race motor? 39* or 45* .with a roller and without

Octania

39
45 is for "3/4 race" motors

Run to Rund

In principle, the 45 degree would be a little better because the pushrods are straighter up from the lifter. In practice, it doesn't matter, and the best would be the .921" lifter blocks which were all 39 deg.

wills30

i have been build a 496 for years now ,and i came across a 66 425 block ,whicj has the 821 lifter and the 45 degree angle and i also have a 70 455 with the 39 degree ,which has been the pig for this build. and i havent place them side by side yet,and compared thickness, which of rumor of the 425 is a thicker block. and if the 425 block is thicker ,this may become an option and just keep the other for a spare or anther build ,i just have really heard of any one or read which would be the best for a high performance build.thanks for the replys