[Synchro909]

When Ford started running pressurised bearings in the B engine, what pressure did they run? Not much. I believe the early V8s only ran about 11 psi. I have a diamond B engine in one of my cars and the oil pressure warning light trips on at 9 psi. I don't know what it runs while operating but I don't think it is much more. When the engine is hot and idling, the light flickers.
I believe that there is too much emphasis on high oil pressure. Look at the trial engine Terry had built and they left out a plug from the main oil gallery, resulting in very little pressure. It survived all attempts to destroy it, yet here we are asking whether 50 psi is OK. I think I'll be aiming at about 25 psi. That should give the bearings plenty and preserve the drive gears. If they were to fail, you would have zero pressure immediately but the bottom end will likely survive because the engine would stop with no drive to the distributor. An automatic protection but a tow home.