COMP Cams 3136 Double Roller Timing Chain Set for 1987-1992 Chevrolet Small Block 305 350 Engines with Factory Roller CamshaftsHi Tech Roller Race Timing Sets; Chevy V6 262, '87 92 w Factory Roller, 305 350, '87 92 w Factory 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