Features: Capable of 6000+ rpm with stock springs and no valve float. Bolt-in cam for heavier touring bikes and high-geared bikes with 65-tooth rear pulleys. Uses stock springs; works with carbs or fuel injection. Crisp throttle response and strong pulling power from 1500 to 6000 rpm. Works well in higher altitudes. Made in the USA. Must check coil bind, valve-to-valve clearance and valve-to-piston clearance..