OTC (6679 Cam Gear Clamp and Holder Set These holders clamp between the engine block or head and the back of the gear to lock it in place The cam gear clamp is used between two adjacent gears to lock them together and eliminate movement Use on single, dual or quad cam engines to hold valve timing during belt replacement Good for diesel injection pump belt replacement The cam gear holder's universal design is quick and easy to install and the cam gear clamp has a positive lock tooth design to secure all sizes of cam gears