Competition Cams CL122102 High Energy/Marine 268H Cam & Lifters Kit For Chevrolet 262-400 Cam and lifter kit for Small Block Chevy engines CL-Kit includes cam, lifters, assembly lube, instructions and decals Hydraulic High Energy: Good street performance with stock converter, choppy idle OR High Energy Marine: Biggest cam for inboard/outboard; good for ski, economy and light performance Valve spring upgrade required