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Click on image for the lowdown. 
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| | | Forums66 Topics128,024 Posts1,055,392 Members48,422 | | 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!
| | THANKS!
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: Mar 2011 Posts: 277 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 277 | I found a post from Lonnie, it looks like 51/52 was the change to the angled ports.
Joe
1955 First Series 3100
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