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Old 07-20-2006, 07:18 PM
Theresa Shank's Avatar
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Distributor Vacuum

We finally broke down and bought a new Edelbrock #1406 carb to replace Quadrajet. Friday is installation day but question of which vacuum port to distributror advance is questionable. Engine is 350 SBC pre electronic ignition so it must be about 72 to 75 vintage. Which vacuum port gives best performance??? THANKS... THERESA

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Old 07-20-2006, 07:39 PM
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Look in the manual that came with your carb..it explains it. Best I remember the Edelbrock has three vacumn ports. One big one for the PCV and two small ones..one of the small ones is ported vacumn ( constant vacumn) and the other is metered ( vacumn as you give it throttle). You want the metered one ( no vacumn at idle) for the vacumn advance on the distributer. I think I am right on that...best I remember anyway. If you did not get a manual with your carb that explains all this...you can go to the Edelbrock web-site and print one out.

Last edited by Henry Highrise; 07-20-2006 at 07:45 PM.
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Old 07-23-2006, 11:22 AM
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"Ported" vacuum is the one with no vacuum at idle. The other is termed "manifold" vacuum and has full vacuum all the time.

The difference in useage applies to the specific engine set up. Some engines prefer one or the other depending on their induction capabilities (how big the cam is).

In either case, the static timing and rpm timing are set with the vacuum can disconnected.

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