General Category > Quadrajet Carb Talk and Tips

Off idle lean condition, suggestions?

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Cadman-iac:

--- Quote from: lightning boy on June 12, 2025, 01:55:13 PM ---It takes more timing to burn a lean mixture.

--- End quote ---

 True,  I've taken that into consideration. Just kicking up the initial timing didn't work out.
 I think I'll have to try playing with the distributor weights and centerplate to get a bit more max timing. I'm just a bit hesitant about adding too much because I can't hear the detonation if it occurs due to my hearing for one, and the lack of guts in the "mufflers". I don't want to find out the hard way that I added too much.

 Rick

Kenth:
With a properly adjusted carburetor idle/lowspeed circuit, altering the ignition curve is seldom if ever needed.

Off-idle hesitation is nearly always cured with larger downchannels.
Your Cadillac carb has around .046" downchannels and they need to be around .052"-.055" for your Chevy engine.
Also look for .035"-.036" idle tubes and .090"-.095" idle needle holes.

HTH

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