C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

BB rear main seal

Thread Tools
 
Search this Thread
 
Old Jun 13, 2022 | 08:04 PM
  #1  
Sayfoo's Avatar
Sayfoo
Thread Starter
Safety Car
Veteran: Army
20 Year Member
Liked
Community Favorite
 
Joined: Sep 2005
Posts: 4,232
Likes: 644
From: Orange County Ca
Default BB rear main seal

I'm leaking around the back of my oil pan and I suspect that it may be the rear main seal.
It's a '69 427. I know I built it with a 2 piece part 15+ yrs. and 27k miles ago when I rebuilt the engine, but I have no idea what part # I used.
So, what are my options today.
I've read about offset seals, twin lip seals, etc.
What to use?
Reply
Old Jun 13, 2022 | 09:15 PM
  #2  
Hopper12's Avatar
Hopper12
Melting Slicks
Liked
Loved
Community Favorite
Top Answer: 5
 
Joined: Dec 2014
Posts: 2,788
Likes: 2,334
From: Central UT
Default

Hi Sayfoo, check the back of your intake manifold and the valve cover gasket too. If you need a rear main, it's not that difficult (need to remove the pan, which means you need to remove the relay rod, etc., but not all that bad) to get to it. If you need the rms, here is the one I used last year: https://www.drivparts.com/part-detai...t%20Seal%20Set . https://www.drivparts.com/part-detai...20Gasket%20Set

Good luck and have some fun while you're at it by doing a bit more 'while you're in there' like cleaning up the oil pan, etc. Best, Paul
Reply
Old Jun 14, 2022 | 09:49 AM
  #3  
Sigforty's Avatar
Sigforty
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Default

I like the Viton seals like the Felpro 2918. You should only need an offset seal if the crankshaft has a groove worn into it.
Reply
Old Jun 14, 2022 | 10:06 AM
  #4  
RatRacer's Avatar
RatRacer
Safety Car
20 Year Member
 
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Default

Originally Posted by Sigforty
I like the Viton seals like the Felpro 2918. You should only need an offset seal if the crankshaft has a groove worn into it.
When I rebuilt my LS5 back in the 90s, no offset BB main seals were available. I ended up buying a new LS7 crank, which were fairly inexpensive at the time.
Reply

Get notified of new replies

To BB rear main seal





All times are GMT -4. The time now is 04:17 PM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-4
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-5
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-6
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-7
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-8
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-9
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE