Originally posted by Knobie
I just about smoked a 3/8 makita drill trying to prime my sbc. I then borrowed a 1/2" drill and it took about 30 secs before the oil pumped through the pushrods.
This is the main problem. 3/8" drills just don't have enough power and you will fry them if you spin the pump for any time at all. It is just a fact that any 3/8" drill is being way overpowered by an oil pump and they all will fry fairly quickly. 1/2" drill is the proper way to do it. And 5 minutes is WAY too long. Pump 'til oil shows at the rockers and call it good. Don't tell anyone, but between you and me, I never pre-prime an engine and haven't lost one in 30 years of trying. Just crank the engine w/ coil wire out 'til I see oil pressure on the gauge then plug in coil wire and fire it up.