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Click on image for the lowdown. 
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| | | Forums66 Topics128,110 Posts1,056,246 Members48,437 | | 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 2008 Posts: 125 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 125 | Vacuum is always higher with the throttle closed. When you open the throttle reducing the restriction it drops, until rpms pull more air through the carb, then the opened throttle becomes restrictive again (to the bigger chunk of air being pulled in) and vacuum rises again.
Who is John Galt?
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