COMP Cams 8110 Adjustable Billet Timing Chain Set for Chevrolet Big Block 396 427 454 EnginesUltimate Adjustable Billet Timing Sets; Chevy 396 454, '65 96 High strength billet gears and seamless roller timing chain deliver years of reliable service Features 2 degree incremental adjustability, 6 degree maximum advance retard Unique design yields precise camshaft timing and durability Includes Torrington roller thrust bearing for reduced friction and custom adjusting tool Ideal for all street performance and race applications