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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,042 Posts1,055,509 Members48,424 | | 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: Mar 2005 Posts: 1,636 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,636 | Another easy check for the vacuum advance is to take the hose off, turn the distributor to advance it manually, then place you finger over the fitting where the vacuum line goes.
If it's holding, when you let go of the distributor you should feel a bit of suction on your finger. The distributor body may not return all the way to where it started from until you take you finger off the fitting. | | |
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