It looks like this may not be possible. Pre 68 Dave just called my attention to the slinger behind the rear bearing journal. It looks like the slinger is centered in a groove machined in the block and main cap and it looks like a drain back hole directs oil from the slinger back to the pan.
In that case what I'm attempting can't be done because the drain back hole provides a route around the bearing for air to leak through and that is what makes it impossible to create vacuum in the crankcase.. Can anyone who's been following this discussion think of a solution to that problem short of pulling the engine and machining the block and main cap for a seal? At age 73 that's not a can of worms I really want to open.
Some people have mentioned a check ball in that drain back hole. Does anyone know if that check ball is present in a '36? If it is there crankcase vacuum would tend to pull it open keeping the air leak constant.
To all who have commented on this, thanks for your interest and if you have any ideas on how to move forward I'd really like to hear them.
