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Mod | | | Forums66 Topics128,087 Posts1,055,980 Members48,430 | | 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!
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| | | | Joined: Mar 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | I just bought a vacuum gauge to fine tune my 54 235 with a Rochester B. What is the best place to hook to? I have a port on the carb that's plugged (I think it was a BC in a previous life) or I can connect to the manifold. My understanding is when tuning this way you need to leave the vacuum advance hooked up. Thanks for your patience and help. John | | | | | Joined: May 2015 Posts: 11,054 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,054 | Vacuum gauge needs to be connected to a non-restricted vacuum port. Typically at the bottom flange of the carb, or on the manifold itself. Where vacuum wipers would hook up would be a non-restricted port.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: Mar 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | Thanks, that's what I thought. One of those times I started to overthink the problem, seems I do a lot of that anymore. John | | | | | Joined: Jun 2008 Posts: 1,644 'Bolter | | 'Bolter Joined: Jun 2008 Posts: 1,644 | I just bought a new vacuum gauge off FleaBay to adjust my new Carter carb with. I hooked it directly to the nipple on the manifold after I pulled off the wiper hose. Worked like a charm.
Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
| | | | | Joined: Aug 2017 Posts: 660 'Bolter | | 'Bolter Joined: Aug 2017 Posts: 660 | Hook it up to Manifold NOT carburetor.
Carburetor is not supposed to have vaccum at Idle...
Last edited by Shaffer's1950; 04/18/2020 4:06 PM.
1950 Chevy 3100
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