COMP Cams 7100 Billet Double Roller Timing for Chevrolet Small Block SBC 260-400 Engines with Flat Tappet CamshaftsKeyway Adjustable Billet Timing Sets; Chevy 265 400 These timing sets feature: * Induction hardened steel billet gears for durability * 9 keyway crank sprocket for 2 degree incremental adjustability, 8 degree maximum advance retard * Pre stretched, heat treated double roller chain with heavy duty large pin design * Includes Torrington roller thrust bearing for reduced friction