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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,050 Posts1,055,676 Members48,426 | | 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: Dec 2003 Posts: 1,061 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,061 | If you apply suction to the vacuum advance, should it hold the pressure indefinitely or does it gradually release? I have several of these and want to bench test them.
1946 1-ton Panel
1952 1-ton Comml. W/Grain Body
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