The Edelbrock Performance RPM Camshaft and Lifter Kit are part of the total power package as they dyno-match the power band of their Performer RPM Series of intake manifolds. This is done by testing and tuning them together on engine dynamometers for maximum performance. The advertised intake duration is 308 degrees and the exhaust duration is 320 degrees. The camshaft comes with hydraulic lifters, assembly lube and full instructions. The intake valve lift with factory rocker arm ratio is 0. 470 and the exhaust valve lift with factory rocker arm ratio is 0. 470. These cams are for high performance street use only and are not for heavy vehicles.