KIBBLEWHITE VALVE EXHAUST 1.575″ 20-20776

Some Twin Cam heads using 7.0mm valves may crack in the port end of the valve guide boss, These valves have .005″ oversize stems to re-establish the correct valve stem to valve guide clearance if the head has cracked, Valve guides must be reamed/honed to set correct clearance, the a valve job performed to ensure proper sealing, Oversize portion of the valve stem does not extend into the keeper groove area; OEM valve keepers can be used