Chevy Small Block 4.3L-6.6L/262-400 Cubic Inch; Hydraulic Flat Tappet; 2300-6500 RPM Range; 240 Degree Intake Duration @ 0.050 Inch Lift; 246 Degree Exhaust Duration @ 0.050 Inch Lift; 0.507 Inch Intake Valve Lift; 0.510 Inch Exhaust Valve Lift; 110 Degree Lobe Separation