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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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| | | | Joined: Jun 2005 Posts: 388 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 388 | How is the vacuum being measured? Try disconnecting the linkage between the two carburetors and see how it operates with one of the carburetors completely closed, as if it were a secondary with progressive linkage. Then switch carburetors and see what happens. If the throttle plates are closing properly you should be able to run the idle mixture screws all the way in. Some secondary carburetors have no idle screws or idle fuel passages.
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