COMP Cams CL12-234-2 Xtreme Energy XE256H-10 Cam and Lifter Kit for Small Block Chevy Cam and lifter kit for Small Block Chevy engines CL-Kit includes cam, lifters, assembly lube, instructions and decals Hydraulic Xtreme Energy: Strong torque through low end and mid-range, good idle Valve spring upgrade required Cam and lifter kit for Small Block Chevy engines Hydraulic Xtreme Energy: Strong torque through low end and mid-range, good idle Valve spring upgrade required