Your correct brokenhead, the GMC rod conversion was done on the babbited cranks for many many years before the full pressure Stovebolt's even came along in 1953, and you can't do the GMC rod conversion without having oil holes in the crank to oil the rod bearings. Guy's and hotrodders back then were true doers, not followers like some are today, and most were machinists or had buddies that were. There is also a new Stovebolt performance book series fixing to be printed that shows how to do a GMC rod conversion in the later full pressure Stovebolt's.
