Oil Pump Big TwinCaracteristicas: Constructed of high quality billet aluminum with a polished finish Unique three valve system delivers 8 10 lb. of oil pressure to the crankshaft at idle (all other oil pumps have a pressure valve that closes at idle, denying the crankshaft oil flow at idle) Stainless steel check valve eliminates wet sumping upon start up; positively will not leak oil into the lower end during storage No provisions for primary or rear chain oiling U.