Adjustable Double Roller Timing Set for Oldsmobile 400-455

Include induction hardened Steel billet Gears for bullet proof durability. Feature infinitely adjustable Camshaft sprocket, 6-degree maximum advance/retard.3 keyway crank sprocket for additional 4-degree incremental adjustability. Pre-stretched, heat-treated double Roller chain with heavy-duty large pin design; chain available separately. Ideal for all street performance and race applications.