AFR 165, 185 or Trickflow

5spd GT said:
Rick - Does the piston -cc come from just the valve relief deepness and size or the flatness or non-flatness of the piston as well?


The advertised cc of a piston takes into account the valve reliefs, however in theory the flatness of the piston could effect it. I will say most of the "good" aftermarket pistons are very flat from what I have found.