[rotorwrench]

My guess is that the wartime stuff depleted rather quickly after the war and production changed to meet modern standards. I've always thought this to be true but had no way to confirm since those engines are rare where I come from. It sounds like some of you other folks could confirm that. The engine type was manufactured a long time and bound to have been updated, especially for use in trucks. When Ford USA changed over to the long snout crank in 1938, they developed the crank sheave to keep the early style fan drive on the generator for another year or so in the standard models & commercial pickups. These were on 24 stud engines though. Canadian and UK production stuck with the 21-stud a lot longer than US production because of the wartime needs. If it ain't broke, don't try to fix it. A lot of universal carriers were built in Canada, UK, and even in the USA. The US built ones were different though. They used the 29A 239 engine in them and they were longer & therefore heavier.