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Click on image for the lowdown. 
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| | | Forums66 Topics128,088 Posts1,056,386 Members48,442 | | 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: Sep 2006 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2006 Posts: 47 | Jon, thanks for the reply. Carb # is7045589('74-'77 CA Chevy/GMC).I have Ruggles book on order...been studying Doug Roe's Rochester Carbs(HP Books). Reduced the tension on the secondary air valves by 1/4 turn and swapped hangers from D to J.
Improved response quite a bit. | | |
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