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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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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: Jul 2014 Posts: 892 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 892 | An NOS one will have a removable cap with a spring under it so you can experiment all you want shimming the spring to advance or delay the vacuum advance. I have never mucked around with that but there are specs and I think the trucks were different than the cars. Advance was supposed to start at 4 in hg IIRC.
The fifties GMC medium and heavy trucks I worked on didn't have a vacuum advance at all. Think of a GMC dump truck grossing 32,000 powered by a 270. The throttle only had two useful positions; wide open or idle.
1951 3800 1-ton"Earning its keep from the get-go"In the DITY Gallery1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971. | | |
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