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Mod | | | Forums66 Topics128,028 Posts1,055,414 Members48,422 | | 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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The vacuum control further advances your timing at high vacuum situations. It was mainly designed for a little more fuel economy. Most larger trucks had no vacuum control because they were at full throttle most of the time. The chances are good that you have a ruptured diaphragm or the linkage is hanging. When my jalopies are running good, I leave them alone. | | |
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