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Click on image for the lowdown. 
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| | | Forums66 Topics128,074 Posts1,055,913 Members48,429 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I have run 216s, 235s, and 261s.
Each "step up" resulted (as expected) in a noticeable difference in power.
Another "swap" that results in a noticeable different in gas mileage and "smoother" running is to install the 3.55 rear-end conversion gear-set (R&P Ring&Pinion set sold my MotherTrucker). Buy and use an installation-parts kit that is available from a few old-chevy-parts vendors. | | |
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