High lift camshaft for modified engines with 106" or greater displacement and compression ratios between 10.0:1 to 11.0:1, Works with stock, unported heads, but S&S CNC ported heads are recommended, Best power from 3000-600 rpm, This is not a bolt in camshaft kit, Kit includes camshafts, bearings, gearcover gasket, retaining ring, o-ring, thread lock and instructions, Made in the USA, Installer must check coil bind, valve to valve clearance and valve to piston clearance