Several places used to do that years ago, including one of the camshaft regrinders, so if they could figure it out using manual machine tools, a modern CNC shop could most likely do the same thing with a minimum of programming. It would also be possible to use a pressed-in piece of seamless tubing (like a small block V8 pushrod) to fabricate an oil gallery, staked or welded into place to keep it steady from centrifugal force. "Impossible" only means that somebody hasn't done it yet! I've got a bolt-on jig on the drawing board, one that would attach to a rod journal and guide a long drill bit with hardened steel drill bushings. Once a small diameter hole (maybe 1/8" or 3/16") is in the right position from the rod to main journal, it can be reamed or otherwise enlarged to make an oil passage.
Jerry
