It looks like your compression ratio is going to be around 10:1 with those heads. If I'm right, then you'll have a lot of midrange detonation with the XE cam. The 068 cam is better, but you should also consider the crane 222/234 cam (also on 114 lobe centers). It has a bit more lift than the 068.
1.65 ratio rockers can def make a diff. But stay within the limits of your springs if you choose the crane (maybe 1.65 on intake only?).
__________________
greg
1976 SE 455 twin turbo
austin, tx
|