Camshaft Kit – 635 H.O. – Gear Drive – Twin Cam

Reverses the rear cam’s direction of rotation, providing additional operating clearance between cam lobes; as a result, higher cam lifts are possible ; High lift camshaft for modified engines with 106″ or greater displacement and compression ratios between 10.0:1 to 11.0:1; Increases valve and timing accuracy by eliminating timing chain lash and loosely-fit stock chain drive; Works with stock, unported heads, but S&S CNC ported heads are recommended; Material must be removed from inner surface of the stock gear cover to install; A hydraulic press and other professional level tools are required to install; S&S requires that adjustable pushrod/cover kit be used; Cam bearings and gaskets must be replaced when installing new cams; Best power from 3000-6000 rpm; This is not a bolt in camshaft kit; Kit includes camshafts, inner gear, out gear drives, inner bearings, outer bearings, gaskets and instructions; Made in the USA; Installer must check coil bind, valve to valve clearance and valve to piston clearance.; Due to the inherent characteristics of gear drives, you may experience more valve train noise.