Brand New Part # 413-920S Red Shift 577TC Performance Cams, Chain Drive, 1999-2006 Twin Cam Engines 577TC: Performance cams for 95 and larger Twin Cam engines. Nice, smooth power and big torque in engines with good flowing heads, increased compression (10.0+) performance ignition, exhaust and a larger carb or throttle body. Bolt-in with conical springs or CVO 103 heads; runs very quiet. Can produce 105-110 rear wheel horsepower and torque in 95 engines. Adjustable pushrods required. Recommended Top End Gasket Kits: Choose a full top end gasket kit if you re doing headwork with cam install or a cam-change-only kit for bolt-in cams which do not require head removal (includes cam, tappet, rocker lid gaskets and pushrod o-rings). **These cams can not be used in 2006 FXD engines.**