Gear for Gear-Driven CamsA four-gear set is required for gear-driven cams that do not come with secondary cam gears; includes two secondary cam gears, outer cam drive gear, outer pinion drive gear and mounting hardware 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 Made in the U.S.A. It is the installer’s responsibility to check all clearances and follow all procedures in the S&S instructions and Harley-Davidson manual.