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Click on image for the lowdown. 
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| | | Forums66 Topics128,091 Posts1,056,034 Members48,433 | | 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: Jul 2023 Posts: 4 Moderated | | Moderated Joined: Jul 2023 Posts: 4 | Any ideas out there about what Idle vacume should be?? We have what appears to be a 261 in a 1950 C3100 compression seems ok 90-140 psi but the Idle vacume is around 12 in.
Bob O'Neal
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