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ORIGINAL: 2002GTAUTOVERT
some of the stage 2's require work due to piston slap.. VT's cams dont... you can run stage 1 or 2 cams with stock heads but with stage 2's youll need a valve spring upgrade.. i was simply saying if you have any head work after you put those cams in.. you might consider a tune to take advantage of the better flow
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I believe piston slap is the term used for when the cylinder is over bored and there is too much piston to wall clearance and the pistons slap inside the cylinder. What you are talking about is an issue with PTV (Piston To Valve)clearance, which is when the valve will hit the piston and put a 1/2 moon cut into the piston.