Classic Industries offers a LIMITED selection of original GM NOS (new old stock) pistons for high performance big block engines. This listing is for a 502 Mark V,.030, O.S., 8.75:1. This is an NOS GM piston, part # 12533553....
68-73 454 Piston Pin Retainer.072
For use when converting special high performance and heavy duty 454 pistons to floating pins. (Spirolox). 072 is recommended for competition engines. The piston retainer grooves may have to be widened to fit the spirolox. GM...