Originally Posted by exodus
those of you planning on going turbo might want to stay away from these in preference of your own custom profile.
Correct me if I'm wrong, or if these profiles will cover it:
My understanding is for any decent amount of boost you'll want a decent amount of valve overlap. Meaning you'll want the intake and exhaust valves open at the same time. This will allow the charged clean air being pushed into the cylinder to help expel the exhaust gases, which will be more than the amount the engine was designed for (due to the excess fuel).
I believe you can also fine tune compression ratios to a greater degree of accuracy by changing cam profile, than by changing the width of the head gasket.