COMP Cams 3100 Hi-Tech Double Roller Race Timing Chain Set for Chevrolet Small Block 327 350 5.7L EnginesHi Tech Roller Race Timing Sets; Chevy SBC '55 91 (Except w OE Roller Cam) Cast Iron camshaft gear and induction hardened billet steel crank sprocket Feature 3 keyway crank sprocket for 4 degree incremental adjustability, 4 degree maximum advance retard Pre stretched, heat treated double roller chain with heavy duty large pin design; chain available separately Dynamically balanced and quality checked for run out tolerances Ideal for all street