we primed a big block with one of those differential lube pumps, stuck the plastic tube with no tip in the threaded oil filter boss (fit pretty good) and pumped..and pumped. We actualy got a reading on our oil pressure guage and oil up top in the rockers. Spun a full filter on and kicked her over. Ghetto, but I think it worked...It was sunday night and no place was open to buy the 5/16 hex shaft.