Twin Power is proud to introduce a new line of high quality USA made valve and spring kits to the product line. These are offered as Replacement Valve Kits or Complete Engine Kits. Valve kits include (4) stock size valves for each application. Engine kits include (4) valves, A complete OEM replacement style spring kit, steel retainers and keepers, and valve guide seals (where applicable). From Knuckleheads to the latest Twin Cam models, we give you everything you need in one kit. Only one part number to order for a complete cylinder head overhaul. (Note: dealer must install and fit valve guides as needed). Made in USA.