COMP Cams 2113 Magnum Timing Chain Set for 1965-1983 Oldsmobile 260-455 EnginesMagnum Timing Sets; Oldsmobile 260 455, '65 83 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