For Use With Chevy Small Block 4.3L-6.6L/262-400 Cubic Inch; Double Roller Chain Drive; Hydraulic Flat Tappet; 1600-5800 RPM Range; 224 Degree Intake Duration @ 0.050 Inch Lift; 230 Degree Exhaust Duration @ 0.050 Inch Lift; 0.477 Inch Intake Valve Lift; 0.480 Inch Exhaust Valve Lift; 110 Degree Lobe Separation; With Lifters/Valve Springs/Retainers/Locks/Valve Stem Seals/Timing Chain Set/Assembly Lube/Decals/Instructions