Ordering parts from Speedway/person on the other end of the phone was an ex-machinist who had worked at speedway for years. Conversation turned to flatheads(I have over 55 years experience)with flat-motors and I was the salesman(friend of the buyer) for the French flatheads that came into Texas in the late 90’s. He asked me if I had heard of the Ford OOPS motor. I said I had never heard of them. When he was a machinist in the 90’s, he was rebuilding a motor and ordered new cam bearing as part of the package.He went to install them and found they “dropped” thru the normal bores that held the bearings. The “tunnel” was .020 LARGER than it should have been. He did some research and found Ford had mistakenly cast around 1,000 engines before discovering the OOPS. They manufactured 100 sets of .020 oversized cam bearings rather than scrapping the “mistake”. All 100 sets were purchased by Red’s Headers out of Cali and he purchased a set to complete his overhaul. He said Ford called it the OOPS motor; something I never heard of!