COMP Cams High Energy 268H-10 Hydraulic Camshaft for Big Block Chrysler, Single Bolt. High Energy Hydraulic Flat Tappet Camshafts. Hydraulic, Great Replacement for 383 Magnum w/ 650-750 CFM Carb, Dual Plane Manifold, etc, Smooth Idle 440 w/ Super Torque. All COMP Cams Camshafts are manufactured to the strictest tolerances. Rigorously tested and checked for quality. Work well with mainly stock components (rockers, manifolds, heads, compression, converters, gears, etc.) Good blend of efficiency & performance. Perfect choice for performance street rebuilds.