Competition Cams 2120 Magnum Double Roller Timing Set for Ford 289, 302, '65-'88 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 true double roller timing chain; chain available separately Ideal for mild street performance applications