COMP Cams Additives 4922 COMP Cams Engine Prelube Primers allow the oil pump to be primed and the engine prelubed prior to initial start-up. They feature a top alignment collar and a bushing to pressurize the upper valve train. Engine Oil Pump Primer for Ford 260-351W COMP Cams Engine Prelube Primer for Small Block Ford, 1/4" COMP Cams Oil Pump Primer For Ford 1/4in