[Walt Dupont--Me.]

There is probably enough info on this thread BUT, I'm building what I call a rair engine right now. 59 on the bell, won't hold a pencil, has an aluminum rope rear seal retainer in the rear cap, and is 3-1/16 bore. I've had a few of these 59 blocks with 3-1/16 bore but don't remember seeing an aluminum rear cap seal retainer. OH, also has the round boss on top of the bell to drill for full flow filter. It's blocks like this that keeps use old flathead builders on our toes. Walt