Edelbrock 2157 Performer-Plus Camshaft and Lifter Kit Kit includes a camshaft, hydraulic lifters, assembly lube and full instructions Intakevalvelift withfactory rockerarmis 0.420 and exhaust valve lift is 0.442 Intakecamlift is 0.280 and exhaust valve lift is 0.295 Dual springs should not be used Only stock ratio rocker arms should be used with the kit