Quote Originally Posted by josh green
I am sure they will all be fine for NA, but for boost but off the shelf CP's are weak around the valve releifs. Weisco's and JE are what you see in a lot of race cars. But that really doesnt mean too much b/c I am sure they are custom specs anyway.

That’s when tuning comes into play. We have never had problems around the valve relief’s, i guess certain people do have problems but that comes from detonation, and detonation comes from tuning...