10-06-2013, 02:48 PM | #1 |
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Rear main seal
Is it possible to put a 1 piece rear main seal in a motor that has a 2 piece rear main seal?
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10-06-2013, 03:16 PM | #2 |
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Re: Rear main seal
Simple answer is No. On 1 piece rear main blocks there is an adapter that holds the rear main seal which bolts on externally. Also the crank itself is different.
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10-06-2013, 03:33 PM | #3 |
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Re: Rear main seal
Ok thanks for the info!
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10-07-2013, 04:12 PM | #4 |
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Re: Rear main seal
FWIW, I do know you can go the other way though. I am running an engine in a project that is a 1-piece block with a 2-piece real seal adapter. The reason for doing this is if you have a special crank (perhaps a custom internally balanced crank in a stroker for example) and you want to cheaply run it in a modern roller/vortec block. A high quality adapter won't leak and makes it easier to change the 2-piece seal if needed. Not saying running one of these is a great idea. Switching a 1-piece for a 2-piece is going backwards, but it does work if you need it for some reason. It used to be an old school (well late 80s & 90s) hot rod trick since it will expand your options if you want an internally balanced crank on a 1-piece block. Normally a 1-piece block eliminates some (or all) of the rear counterweight on the crank thus often forcing an external balance crank on 99% of the 1-piece projects. That's a little more history as to why it's hard to switch from one to the other.
Nowadays there are many more crank choices available, so it isn't as common to do the 1-piece to 2-piece conversion.
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10-09-2013, 03:24 PM | #5 | |
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Re: Rear main seal
Quote:
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10-09-2013, 04:36 PM | #6 |
*** That's interesting ***
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Re: Rear main seal
Yeah, I know, hence the "for what it's worth" -- in case there were others reading who wondered if you can go the other way.
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Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
10-13-2013, 02:15 PM | #7 |
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Re: Rear main seal
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