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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,327 Members48,419 | | 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: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | The General rule of thumb is that a 261 had a 1 11/16" throttle bore and the 235 had a 1 9/16" bore. Of course there is always exceptions to the rule. I read somewhere that there was over 140 different models of the rochester 1bbl. | | |
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