Comp Cams 2100 Magnum Double Roller Timing Chain Set for Chevrolet Small Block 283 350 400 Engines with Flat Tappet CamshaftsMagnum Timing Sets; Chevy 65 400, '55 91; V6 200,229,262, '78 86 (Except w Factory Roller) 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