Edelbrock 2167 Performer-Plus Camshaft and Lifter Kit Kit includes a camshaft, hydraulic lifters, assembly lube and full instructions Intakevalvelift withfactory rockerarmis 0.460 and exhaust valve lift is 0.480 Intakecamlift is 0.265 and exhaust valve lift is 0.280 Dual springs should not be used Only stock ratio rocker arms should be used with the kit