327 w/ quadrajet and pwrglide vaccum diagram request - Chevelle Tech
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post #1 of 10 (permalink) Old Aug 6th, 06, 8:38 PM Thread Starter
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327 w/ quadrajet and pwrglide vaccum diagram request

I would appreciate info on the best way to hook up the vaccum lines on a 327 with powerglide. I am running a quadrajet on an edelbrock performer intake. I know.....need a better carb.....but it must wait a bit for the budjet to rebuild. Would appreciate suggestion on best carb for the money. I am running a fairly mild cam---442/465 112 separaton. Just want a fun street car for an economy budget. Thanks for any suggestions.
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post #2 of 10 (permalink) Old Aug 7th, 06, 3:53 PM
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Smile Re: 327 w/ quadrajet and pwrglide vaccum diagram request

The quadrajet is a great carb for any SBC esp a 327 & bPG trans.

If the carb is in need of a rbld send it to Sean Murphy Induction (See his website for details) because he does good quality work @ relaisitic affordable prices esp if you already have the carb which you do.

Scott

SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
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post #3 of 10 (permalink) Old Aug 7th, 06, 5:53 PM
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

I completely agree with SWHEATON. A Q-Jet is perfect for your application and is all the carb you'll ever need. In your case it's gonna be all about how you tune the secondary upper doors to open as the engine can handle the additional air. Your 327 can run all day at 6500 RPM if you build it right and give it a good cooling system. The Q-jet will deliver air more than adequately at that RPM.
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post #4 of 10 (permalink) Old Aug 7th, 06, 5:58 PM
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

A rebuild kit for your Q-jet is probably under $30. They are relatively simple to work on so if you have done other mechanical work on your car you can certainly tackle a Q-jet rebuild. Tuning (jets, rods, air bleeds, etc.) is a different story but chances are your carb will work just fine for your purposes following a good rebuild. If the carb is of 1975 or newer vintage they can have issues with idle air bleeds being too big or too small, but if it's an older one and in basically good shape you should already have one of the best carbs for your application.

Last edited by Rich-L79; Aug 7th, 06 at 8:37 PM.
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post #5 of 10 (permalink) Old Aug 7th, 06, 6:25 PM Thread Starter
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

Thanks for the info. Can anyone help me with the vacuum lines?
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post #6 of 10 (permalink) Old Aug 7th, 06, 7:48 PM
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

What vacuum lines do you have? One for the distributor vacuum advance. Hook that to a manifold vacuum source. Sould be one on the fron't of the carburetor.

Power brakes? There should be a manifold vacuum port sized correctly on the back of the Q-Jet.

Heater controller? That needs manifold vacuum.

Choke pull off? Manifold vacuum. There should be a port adjacent to the pull off.

PCV , manifold vacuum. Thats a 3'8" line so that'll probably go to the vacuum port on the manifold behind the carburetor.

Vacuum modulator. Frankly I don't recall if a PG has one but if it does the line will go to the same multiport that the PCV vacuum line does.


Not sure you have any other vacuum lines. There weren't many back when cars were being made with 327's.
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post #7 of 10 (permalink) Old Aug 7th, 06, 8:57 PM Thread Starter
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

Thanks. This carb has two small and one large port in front of carb, a port on the passenger side of the carb. also have an intake port behind the carb. i need to hook up powerglide modulator, dist advance, brake booster, and a valve cover cap with a built in pcv valve. this is a 1962 327 that originally had one of the old style "vented" systems that i pluged and now am adding pcv instead. thanks for your help.
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post #8 of 10 (permalink) Old Aug 7th, 06, 11:54 PM
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

Let's see, large front port to the PCV (I assume you have a breather cap in the opposite valve cover), the small port on the passenger side front usually goes to a vacuum can attached to the choke linkage and the small port on the drivers side front is for the distributor vacuum advance.

The large port at the rear is for power brakes. The transmission modulator can be connected to a fitting on the backside of the intake manifold or a "T" connector can be installed in the rear carb port splitting it for the brakes and transmission.
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post #9 of 10 (permalink) Old Aug 8th, 06, 12:08 AM
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

Here, this should help with the front vacuum lines at least. You'll note the line I marked for the distributor is plugged off, I was experimenting with manifold vacuum for the advance. The line as marked in the picture is for ported vacuum and I found it works better in my instance.

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post #10 of 10 (permalink) Old Aug 8th, 06, 8:22 AM Thread Starter
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Re: 327 w/ quadrajet and pwrglide vaccum diagram request

thanks.....i really appreciate your time and effort.
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