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Click on image for the lowdown. 
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| | | Forums66 Topics128,162 Posts1,057,057 Members48,463 | | 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: Dec 2017 Posts: 1,652 'Bolter | | 'Bolter Joined: Dec 2017 Posts: 1,652 | Correct. 56 pass car was first year for neoprene and the rear main cap was machined specifically for that seal, whereas the earlier motors had less precise, deeper, cavities for the rope seal.
Mike
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