This is for use in a 350 Pontiac. Pontiac piston comp dist. 1.700, Mopar comp dist 1.720-1.745, at 1.745 it is a zero deck, piston weight = identical, pin size, hone rod .0037+ add full float. counterweight clearance= good. bore size, 3.875 +.035= standard 318= fixes a rusty 350.
