nother, question....I am thinking of buying the zz383 from gmpp, what is the max lift on the fast burn heads? it kinda has a small cam in it, I like a rough idle....

I know they will go .530 for sure.

I'm also using 1.6 rockers.

That's all I got.

I know they will go .530 for sure.

I'm also using 1.6 rockers.

That's all I got.

I hope that could be streatched to .531! that is the lift on the thumpr cam

with a roller that should be fine.
The stress on the valvetrain from a solid is worse than a hyd which is harder than a roller, When they are all they same cam.