plastiguaging cams and pistons? um no, think you got that confused with claying the motor for piston to valve clearance. I have 2 friends with CTR pistons. One runs Skunk Stage 1's. and The other runs TODA Spec B's. But with any motor you want to clay it. And if on a VTEC motor you want to make sure your running off your vtec lobe because thats where your biggest lift and duration numbers are.