1986 and older are 2 piece.
Yep, they have one. 1986 and older has a two piece rear main seal. 1987 and up has a one piece rear main seal.
2
two
because their piece of junk!
NO you can not. The crankshaft and rearmain cap is not designed for a 2 piece seal. Must use a 1 piece seal ONLY.
1967
no ,the 1986 and up blocks have a one piece rear main seal and will not fit in the earlier blocks.gmjim
Chevy in 1977 changed the rear main oil seal to a one piece seal. the older crankshaft wont work.
Some cranks are cast, some are forged. Pre-1987 are two piece rear main seal. 1987 and up are one piece. Rod and main journal diameters are all the same.
That would be a 1 piece seal, They quite using 2 piece seals in the 80's
Start looking at fire and gas. Trace these two that are the main problems.