My motor came with the rear main split plastic seal installed but has bolt holes for the flange style seal. I am not sure if i should put back what was in it or switch to the flange style. Or can I us both? I am just trying to avoid leaks and don't know what one works best. Best gasket sell both sty...

Thanks for the reply. Just found a replacement engine so I am going to start fresh.

Hi guys, This is my first post, but I have been using this forum to help me restore my M37. It has been a wealth of knowledge and inspiring to say the least. But I have hit a road block in rebuilding the engine. I have a block from 1959 (Stamped M230) and it has been bored out to fit .080 pistons. F...