[unruhjonny]

I was scratching my head on throwing 1.65 rockers on a high lift cam;
That cam specs out at .466" & .488" lift with a 1.5 rocker;
Unless my math is wrong, that's .513" & .537" lift;
If the heads are not setup for that much lift, this may be a part of the problem.

I also know that the advertised durations make this cam appear to be a high lift 068, but the @0.050" duration numbers suggest that this is actually much larger;
It appears to me that this grind has 10(int) & 11(exh) degrees more duration than the 068;
The @0.050" duration numbers put it closer to a 744.

Wasn't the consensus that #62 heads were more around 78cc's?
If the engines details haven't all been confirmed, this could be a 9:1 (or slightly less) compression engine - and with a cam that big, if you don't have enough compression, I am told that you might have something of a pig...