Oil Pump Primer; 3/8 in. Chuck In Hand Drill; Ford 351C/351W/400/429/460 cid.; Black Oxide Finish; • Used to build up oil pressure in a new engine before initial starting • Remove the distributor and insert the primer to engage the end of the oil pump drive • The other end of the primer fits a 3/8" chuck in a hand drill to drive the oil pump • Black oxide finish resists corrosion