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Old 06-17-2010, 08:09 PM
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Quick Q-Jet Question

I have this brand new quadrajet I want to put on my SBC but it's different than the others I've seen. What is this vacuum canister on the back for? It looks like it keeps the secondaries from opening under high vacuum but I'm not sure. Where do I plumb the vacuum line to? Also, what is this huge hose line on the choke control?



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Old 06-17-2010, 08:51 PM
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It's been a while but I think they used to run it through a temp switch to prevent secondarys from opening when cold. The large tube off the choke housing went to a heat stove in the intake manifold exhaust crossover heat passage with the clean air port for it at the top rear center of the carb. You will probably need to try an electric choke coil and wire it up for your choke to come off. Most performance intakes are set up for a divorced choke setup with the choke coil bolted to the intake and just a rod to the carb.
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Old 06-17-2010, 08:57 PM
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The vacuum can is called a rear or secondary vacuum break assembly. The vacuum port gets manifold vacuum.

The choke has a hot air port, this is plumbed to a source of heat,usually at the exhaust crossover to cause the choke to open. Heat is drawn into the housing by a small vacuum supply hole located inside the choke housing.

The metal tube that connects to the choke housing most always had a length of fiberglass-looking insulation tubing covering it.
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