COMP Cams 2112 Magnum Timing Chain Set for 1955-1981 Pontiac 265 - 455 EnginesMagnum Timing Sets; Pontiac 265 455, '55 81 Feature induction hardened cast iron camshaft gear and billet steel crank sprocket 3 keyway crank sprocket for 4 degree incremental adjustability, 4 degree maximum advance retard Heavy duty, heat treated double row timing chain; comes complete with gears and chain Ideal for mild street performance applications