Need advice on Vacuum connections - Pontiac GTO Forum
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post #1 of 8 (permalink) Old 11-25-2011, 08:29 PM Thread Starter
 
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Need advice on Vacuum connections

I just bought a new intake and rebuilt carb to replace the old 2bbl that came with my 1972 GTO. The motor is a 1971 400 and was rated for 265 hp. The old carb was gunked up and needed rebuilding so I opted to go ahead and get a 4bbl and new intake. The question I have is around the vacuum connections. On the old 2bbl intake there are no vacuum connections into the intake - on the new one there are two. Can someone tell me which of these two are for the connection to the PCV valve and what the other one is for?
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post #2 of 8 (permalink) Old 11-25-2011, 09:16 PM
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Most often I've seen the PCV valve connected to the one on the "left" in your photo - the one closest to the passenger side. The other one, you can use for "whatever" --- transmission vacuum modulator, for example, or power brakes. If you don't need it, just cap it with a good quality rubber (not vinyl) cap.

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post #3 of 8 (permalink) Old 11-25-2011, 10:01 PM
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Most after market suppliers will have this adapter,

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post #4 of 8 (permalink) Old 11-25-2011, 10:26 PM Thread Starter
 
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Thank you Bear and 05GTO. I certainly appreciate the advice.

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post #5 of 8 (permalink) Old 11-26-2011, 07:26 AM
 
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When you get er going, run it down here to the Shenandoah valley..

Best of luck with the resto

Dan
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post #6 of 8 (permalink) Old 11-26-2011, 10:52 AM
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As 05's photo shows, BOTH outlets are for PCV. There is a Tee that is needed to connect the hoses, and also, one of the hoses is "formed". All available at the vendors.
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post #7 of 8 (permalink) Old 11-26-2011, 11:32 AM
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The TEE, I believe was only used in 66 and 67, your set-up with the Carter AFB appears to be from a 66.

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post #8 of 8 (permalink) Old 11-30-2011, 07:33 PM
 
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that is a 66 intake with an AFB, thus the dual ports for PCV.
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