| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,078 Posts1,055,935 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
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: 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: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | 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: 29,778 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,778 | 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!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | 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. | | |
|
|
| |
