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Old 10-11-2020, 05:01 PM
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Default Does anyone have the vacuum hose diagram for a 1974 400 4-speed?

I am ready to install my new vacuum hoses on the '74. The factory service manual does not show a diagram for a 400 4-speed car and the one 4bbl diagram they have shows a dual diaphragm EGR valve which mine does not have. I heard the 1974 Pontiac Exhaust Emissions booklet shows the correct diagram. Anyone have this that can post up the pic? Thanks!

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Old 10-11-2020, 05:41 PM
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Send an email to me:

johnta1@wallaceracing.com

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Old 10-11-2020, 07:05 PM
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Sent!

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Old 10-11-2020, 07:30 PM
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Replied.

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Old 10-11-2020, 07:50 PM
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I supplied the info years ago.

http://www.pontiacpower.org/
.pdf is in engine section.

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Old 10-11-2020, 10:53 PM
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Got the info, thanks! Now another question. Are the vacuum lines attached to the right side valve cover with the nylon straps or do they just lay on that side?

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Old 10-13-2020, 08:46 AM
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The vacuum bundle on my 74 Formula 400 4 speed was just laying on the manifold/valve cover with a semi-adhesive friction tape wrapped around it in a couple of spots. My engine is "restored" but that is how I found it.
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Old 10-14-2020, 07:27 PM
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Quote:
Originally Posted by sp4spd View Post
The vacuum bundle on my 74 Formula 400 4 speed was just laying on the manifold/valve cover with a semi-adhesive friction tape wrapped around it in a couple of spots. My engine is "restored" but that is how I found it.
I have seen other pics like that. Valve cover has the little brackets for the straps to clip into and the GM diagram shows the straps being used. That is how I did mine.

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Old 10-14-2020, 09:03 PM
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Send me a email I have picture a can’t attach here.

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Old 10-15-2020, 04:29 PM
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Quote:
Originally Posted by formula kid View Post
Send me a email I have picture a can’t attach here.
email?

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Old 10-15-2020, 05:14 PM
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Send me a privet message with you email so I can send you pictures of how it is attached.

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Old 10-17-2020, 01:26 AM
Aus78Formula Aus78Formula is offline
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Quote:
Originally Posted by 3tas4me View Post
heard the 1974 Pontiac Exhaust Emissions booklet shows the correct diagram.

Sent you a PM a few days ago. Did you get this sorted? I have the 74 Emissions booklet on file.

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Old 10-22-2020, 09:50 PM
Aus78Formula Aus78Formula is offline
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Alright, good chat.

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