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Jul 21st, 2025 | | | | Joined: Oct 2008 Posts: 283 Shop Shark | | Shop Shark Joined: Oct 2008 Posts: 283 | On a 1958 1/2 ton with a 283 and a Rochester down draft, 2 barrel, carb. Where is the vacuum port supposed to be so one can attach a vacuum gauge to adjust the mixture?
Last edited by GMCAMARO; 07/23/2019 7:38 PM.
| | | | | Joined: Nov 2005 Posts: 6,061 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,061 | Hy GMCAMARO, If I am remembering correctly there should be a port on the back of the carburetor down near the intake manifold, I think it is a 1/4" pipe port, hope that helps. | | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | Most of the intake manifolds have a port about halfway between the carburetor and the distributor. That one has full manifold vacuum and also serves as a connecting point for a PCV valve, power brake booster, etc.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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| | | | | Joined: Oct 2008 Posts: 283 Shop Shark | | Shop Shark Joined: Oct 2008 Posts: 283 | This is interesting, behind the carb near the manifold was 1/2" bolt. I have no vacuum advance and looks like where it goes. Then I remembered a stud with a hole in it, holding down the carb. When I looked in the assembly manual and repair manual I could find no information. The net has shown me these were primarily for cars. Either I have the wrong manifold or the factory was not consistent and mine got the stud. | | |
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