COMP Cams 8100 Adjustable Billet Timing Chain Set for Chevrolet Small Block 283 327 350 400 Engines with Flat Tappet CamshaftsUltimate Adjustable Billet Timing Sets; Chevy V6 90 '78 86, 265 400, '55 91 (Except w Factory Roller) 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