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Re: [GMCnet] My 1976 Palm Beach Project [message #284619 is a reply to message #284615] Tue, 11 August 2015 20:20 Go to previous messageGo to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
Senior Member
Justin,

What you're seeing is completely normal. The front port is into the throat
of the carb ABOVE the butterfly. As soon as the butterfly is tipped open,
that port will see the same vacuum as the rear port. The front is called
"ported vacuum", and it is normal for the distributor's vacuum advance to
be connected there. There are those who argue for using manifold
(non-ported) vacuum for that purpose, but here are ignition timing
consequences to that change from OEM.

My one question is about your statement "back to the vacuum advance, ETC".
There should be no ETC on that hose.

Ken H.


On Tue, Aug 11, 2015 at 9:07 PM, Justin Brady wrote:

> Quick question for those still following along.
> While hooking up my chariot gauge to vacuum I noticed that I have about
> 20in hg at idle coming from the rear vacuum port on the carb.
> From the front port (the one that goes to the front of the engine then
> back to the vacuum advance etc) I only have about 5 in hg.
>
> Does this sound right to anyone? It runs really strong but I'm not sure if
> the vacuum discrepancy is normal or what?
> --
> 1976 Palm Beach 455
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
 
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