Those first moments that an engine runs prior to building oil pressure are when damage can easily occur. ARP's oil pump primer kits let you spin the oil pump with a drill motor and bring the oil pressure up prior to starting the engine. This prevents unnecessary wear or damage to rotating, reciprocating, and valvetrain components. ARP's rugged primer shafts are rated at 170,000 PSI to ensure extended service life. They also feature a special billet aluminum sleeve that accurately positions the shaft and keeps it from wobbling.