S&S 510G Gear Drive Cam Kit Fits 1999-2006 Harley Big Twin

Notes about gear drive kits

Pinion shaft run-out must be checked before installing S&S® gear drive cams. A hydraulic press and other professional tools are required to install S&S gear drive cams. Additionally, material must be removed from the inner surface of the stock gearcover. The stock crankcase will require clearancing for S&S .625″, .640″, and .675″ lift cams. S&S recommends that gear drive cams be installed by a professional mechanic. New cam bearings and a new gearcover gasket are required to complete cam installation. Gear drive cams for 99-06 models require the use of ball bearing style cam bearing rather than the stock roller bearing. Roller bearings have more internal clearance which can cause excessive gear lash and increased noise. The correct parts are provided in S&S Camshaft Installation Kit, part #106-5896. Due to the inherent characteristics of gear drives, you may experience more valve train noise with gear driven cams. Oversized and undersized gears are available to help achieve correct gear lash. We have found that with 160 lb. of valve seat force, the S&S gear drive cams will perform well up to 6200 rpm. If higher rpm is anticipated, valve springs that provide higher seat force should be used.