The 1947 - Present Chevrolet & GMC Truck Message Board Network - 70 C20 750CFM Quadrajet Vacuum Hose Connections

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70 C20 750CFM Quadrajet Vacuum Hose Connections

Can you share some pictures that show the vacuum hose connections on your C20 quadrajet carburetor? Thanks in advance.

Re: 70 C20 750CFM Quadrajet Vacuum Hose Connections

Hmm, if only that easy.

Re: 70 C20 750CFM Quadrajet Vacuum Hose Connections

How so?
You got a pic or a link to the carb you got?
East to tell you what goes where that way.

Re: 70 C20 750CFM Quadrajet Vacuum Hose Connections

Quote:

Originally Posted by CW4B (Post 8325660)

Can you share some pictures that show the vacuum hose connections on your C20 quadrajet carburetor? Thanks in advance.

Your truck is quite similar to mine. What is the number on your carburetor? If it has been changed for something else, it may not have vacuum ports like original.

My truck has the vacuum advance port on the front of the carburetor, opposite where the fuel supply line enters.

PCV port is on the front.
Choke pull-off (if you have an automatic choke) port is right next to the pull-off, with a hose about 1.5" long.
The brake booster has a connection on the manifold, not on the back of the carb.
There is another live vacuum line that attaches near the choke stove in the carburetor base plate; it goes inside the cab and is hooked to the (non-original) vacuum gauge.

Transmission modulator vacuum also feeds from the manifold, like most vehicles.

That's all I have on mine.

Re: 70 C20 750CFM Quadrajet Vacuum Hose Connections

Helpful steeveedee, thanks.