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#1
01-02-2022, 10:01 AM
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Vacuum Port Help
Attached is a picture of an open port. Can someone please tell me if a vacuum hose goes on this port under my air cleaner and what the hose connects to? This is a Quadrajet carburetor on my 1977 Transam 400.
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#2
01-02-2022, 11:01 AM
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That goes to the trans. You have another port plugged og there too.
__________________
🧩 Burds Parts, Finding those Hard to Find PCs, no Fisher Price Toys Here Just Say No To 8” Flakes F ire B irds 🇮🇱 |
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#3
01-02-2022, 11:07 AM
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Yes vacuum modulator hard line has a nipple that plugs in and a rubber hose over the connection.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#4
01-02-2022, 01:18 PM
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Vacuum Port Help
Thank's so much for the information. Every friggen port on my engine has a line to it and one extra outlit was driving me crazy. The transmission, whod a thunk it?!? Again, thank you.
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#5
01-02-2022, 01:33 PM
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Have you got the metal line that runs from the modulator valve to that vacuum port?
Clay |
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#6
01-02-2022, 03:14 PM
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Vacuum Port Help
Clay, thanks for asking but, the lines I have are still on the shelf that were placed there 20 years ago. Slowly, ever so slowly I am getting there.
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#7
01-02-2022, 03:17 PM
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HVAC should pull vac from the tree also
__________________
🧩 Burds Parts, Finding those Hard to Find PCs, no Fisher Price Toys Here Just Say No To 8” Flakes F ire B irds 🇮🇱 |
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#8
01-03-2022, 01:47 AM
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On manual cars, that port is capped. It's usually the one I like to tap for manifold vac readings when I'm tuning the carb.
The larger port to the right of it in the pic goes to the AC controls, smaller to the secondary pulloff, or at least to a TVS that regulates the secondary pulloff. The left port goes to different things depending on model years.
__________________
1979 Trans Am W72 400/4-Speed WS6 - Starlight Black Hardtop  |
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