Induction hardened and precision machined steel billet gears for bulletproof durability in Ford Small Block 1965-88 applications. Featuring 9 keyway crank sprocket for 2-degree incremental adjustability and 8-degree maximum advance/retard, the pre-stretched, heat-treated double roller timing chain with heavy-duty large pin design includes Torrington roller thrust bearing for reduced friction. Ideal for all street performance and race applications.