Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Trouble Tuning Inexperienced

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Cliff Ruggles:
Assuming you are using a dual plane intake the spacers/adapters should have a divider in them to separate the two halves of the intake or basically keep the plenum areas separate.

It's OK to let one side see the other a little bit, but I've done a lot of testing in that area and the best results were always obtained keeping one side so it doesn't see the other very much.

The best results in all testing I've done were to grind about half a silver dollars worth of material out of the divider right between the secondaries as shown below.  On top of that I use a 1/4" open gasket.  Any time I've allowed much more opening than that one side to the other on any dual plane intake I started to see some running and performance issues......Cliff

Cliff Ruggles:
On single plane intakes spacers work very well and best if they are open and well blended into the plenum area.

As far as no control with one idle mixture screw remove the baseplate and verify they plates are fully seated and indexed.  A slight twist in the shaft having one open more than the other can cause issues like you are seeing. 

You can also remove the mixture screws and hit the holes with high pressure compressed air to back-flush them and clear any debris that may be in the idle tubes or passages......

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