You might want to read the thread at Inliners and oldgmctrucks.com about the 270/302 rear main seal issues.

I'm pretty sure you are going to be unhappy with the neoprene unless you polish the crankshaft seal area before you install it- rope and neoprene wear the seal area a bit different and neoprene wants a nice polished surface to ride against or it wears out fast.


Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic.