496 cams are compatible with stock or S&S rocker arms and springsBillet aluminum tappets cuffs have hard-anodized black coating and are stronger than stock to eliminate distortion and improves stablitiy in high-lift situationsCompatible with round or oval port valve springsBoost power and gives a racy, aggressive sound at idleKit includes 496 camshaft with pushrod tubes, S&S premium tappets, billet aluminum tappet cuffs, all necessary gaskets, bearings, and hardware required for a complete installationMade in the USANot for CVO 121''.