Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Stock APT and idal mixture screws setting

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Mr48willys:
Hi
    Does anyone know what the stock setting for the APT and the idal mixture screws are. I live in California and need to pass smog. Trying to get it back to stock as close as possible to pass smog. By the way it is on a 1981 Chevy blazer 305. Also if anyone has any tips for smog and the carb I wouk love to know about them

Thanks for any help

Shark Racer:
Personally, I'd run the car on a smog dyno and dial in the APT at 25mph on the dyno, then set the idle mixture screws.

Cliff Ruggles:
Set the idle mixture screws for best idle quality at the leanest settings.

Set the APT using the "tip-in" procedure in our book.

This will put both idle and part throttle on the edge of lean, and should get it thru emissions....Cliff

Freddiesbuick:

--- Quote from: Cliff Ruggles on October 26, 2012, 09:45:53 AM ---Set the APT using the "tip-in" procedure in our book. This will put both idle and part throttle on the edge of lean, and should get it thru emissions....Cliff

--- End quote ---

What "tip-in procedure"? What book....( I have the Rochester Quadrajet Carburetors book)?  ???

Ethan1:

--- Quote from: Freddiesbuick on December 03, 2012, 05:32:19 PM ---What "tip-in procedure"? What book....( I have the Rochester Quadrajet Carburetors book)?  ???

--- End quote ---

 From the front of Cliff's website:

 

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