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Old 04-10-2022, 08:25 AM
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Default 74 SD T/A Vacuum Line

Pics of underside of air cleaner assembly. Trying to straighten out my vacuum lines, does anyone know where this single vacuum line that is missing goes to? There is nothing on the intake plugged up so no indication of where it should go.

Thanks KC
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Old 04-12-2022, 07:44 PM
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That extra vacuum connection on the air cleaner housing is interesting. My '74 SD (all original) air cleaner housing only has the temp sensor connections, one to the thermac motor, the other to manifold vacuum. Do you know if that's the original air cleaner housing for your car?

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Old 04-12-2022, 08:01 PM
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That`s a good question, I can`t say but my 73 SD T/A does not have this extra line. My 73 is an automatic & the 74 is a stick, don`t know if this matters.
Thanks KC

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Old 04-12-2022, 08:48 PM
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That's a '76-newer air cleaner base.

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Old 04-12-2022, 09:02 PM
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Quote:
Originally Posted by Held for Ransom View Post
That's a '76-newer air cleaner base.
Thank You!

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Old 04-13-2022, 08:15 AM
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Horst has a web page on the 74 emissions that may help in the future:

74 Pontiac Emissions

(Kenth posted this in another thread, forgot Horst had this)


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Old 04-13-2022, 04:17 PM
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Quote:
Originally Posted by johnta1 View Post
Horst has a web page on the 74 emissions that may help in the future:

74 Pontiac Emissions

(Kenth posted this in another thread, forgot Horst had this)

Thank You, great diagram, would you have a 73 diagram also?

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Old 04-13-2022, 07:00 PM
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https://forums.maxperformanceinc.com...d.php?t=806646

Early. Have not come across a later '73 booklet.

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Old 04-13-2022, 09:04 PM
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Quote:
would you have a 73 diagram also?
This is from the 73 bulletin:

Late 1973 Emissions

Page 11 may be what you want?


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Old 04-14-2022, 08:30 AM
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Thank you all for the replies.

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