Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Adjusting Secondary Air Flaps

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Cliff Ruggles:
"I do have a 1/2” open spacer under the carb, and recently I read that you tested those and found they actually hurt performance on dual plane intakes. So I probably need to rethink that."

That's too much open area above the divider.  I've tested open spacers and open gaskets.  More thatn about 1/4" of open area between the carb and dual plane intake can and will cause transition issues going quickly to full throttle.  I'd get rid of the spacer or make a divider for it.....

quadrajam:
If you need a spacer go with a 4 hole phenolic.

QJ

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