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Pontiac Forum: Source of vacuum for booster on 1965 GTO with AFB
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Old July 15th, 2018, 06:43 PM
cnemike cnemike is offline
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Source of vacuum for booster on 1965 GTO with AFB

I am presently restoring a 1965 GTO with the Carter AFB. Can anyone tell me where the correct source for brake booster vacuum would be on this car? There are two vacuum ports on the manifold in front of the carb which go to the PVC valve and there is one small port near the base of the carb on the back side but I am assuming this is vacuum advance for the distributor. No other vacuum sources are present.
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Old July 16th, 2018, 09:51 AM
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melsg5 melsg5 is offline
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In this picture of a 66 it looks like the booster line is running around the back of the carburetor along the right side and to the front of the engine.

this is a 65 California model, similar setup hose running to front

You dont have a copy of the 1965 Chassis Service manual or the 1965 AIM?
1971 GTO 455 HO Ram Air
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Old July 18th, 2018, 08:39 AM
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cammerjeff cammerjeff is offline
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According to every thing I can find on the web, the 64/65 4bbl brake vacuum source is a female port on the back of the Carter AFB that that a hard line threads into. then the hose attaches to the hard line to the booster.

Is there a plugged port around 3/8"?

I should add that I owned 1 65 GTO about 35 years ago, but it was a Tri-power car so I do not have any actual Experience with a AFB equipped Pontiac Engine, a lot of Q-jets but the only AFB powered car I have is the Astre with the Buick 215V8.
2009 G8 GT
2006 Mallet LS2 Solstice
1978 Catalina Safari Buick 350 TH350 soon to have a Pontiac 400 4bbl installed!
1978 Sunbird Safari Buick 3.8 2004R
1977 Astre Formula 215 Buick V8 T-5
1973 Lemans Safari 400 4-speed (factory)
1971 Catalina Freeway Enforcer 455 TH400
1969 Firebird Sprint 301 OHC-6 T-5

Last edited by cammerjeff; July 18th, 2018 at 09:47 AM.
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