635 H.O. Gear Drive Camshaft Kit

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 11.0:1Increases valve and timing accuracy by eliminating timing chain lash and loosely-fit stock chain driveWorks with stock, unported heads, but S&S CNC ported heads are recommendedMaterial must be removed from inner surface of the stock gear cover to installA hydraulic press and other professional level tools are required to installS&S requires that adjustable pushrod/cover kit be usedCam bearings and gaskets must be replaced when installing new camsBest power from 3000-6000 rpmThis is not a bolt in camshaft kitKit includes camshafts, inner gear, out gear drives, inner bearings, outer bearings, gaskets and instructionsMade in the USAInstaller 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.