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The 1 piece is a SOLID round rubber seal. The 2 piece is 2 half's that are the same and they fit together.
From a practical standpoint, the differences are great enough that most of the parts are not interchangeable. Whichever block you go with, you'll need to get the correct parts for it.
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Chevy 350 rear main seal?
Yep, they have one. 1986 and older has a two piece rear main seal. 1987 and up has a one piece rear main seal.
How does an rear crankshaft oil seal operate?
The job of the rear main seal is to keep the oil lubricating the rear main bearing from leaking out. Older model rear main seals were made from a "rope" type of material. Today the rear main seal is a one or two piece seal made from neoprene rubber and is located directly behind the rearmost main bearing journal of the crankshaft.
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That engine has a solid round one piece rear main seal that slides over the rear of the crankshaft. You will either have to remove the engine are transmission to be able to replace the rear seal. No other way to do it. ( BIG JOB ) and a good paying job.
How do you replace a rear main seal?
remove the transmission pry the old seal out and install the new one. piece of cake
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two
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Two
What year did chevy 350 start using a one piece rear main seal?
1986
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The 1990 block would have the integrated one-piece rear main seal. Oil pan and crankshaft are not interchangeable.
Is rear main oil seal 1 or 2 piece on a 1989 3.8l mercury cougar?
its one
