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Click on image for the lowdown. 
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| | | Forums66 Topics128,202 Posts1,057,409 Members48,471 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Any engine with shimmed mains will not except or work well with the rubber seal.
The shims hold the ends of the seal apart creating a oil leak path.
Shims were used until mid 1955 on 235s.
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