Oil Pump Primer KitsThis lets you spin the oil pump with a drill motor and bring up the oil pressure prior to starting the engine. ARPs rugged primer shafts are rated at 170,000 psi to ensure extended service life of this valuable tool. They feature a special billet aluminum sleeve that accurately positions the shaft andkeeps it from wobbling.351C, 351W, 351M, 400, 429/460, 5/16" hex drive