Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

7040207 Baseplate

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boat196:
A screw was added to the front of the baseplate, next to the pcv port. Could you explain the purpose of the screw.
Bob

Cliff Ruggles:
That carburetor used an early APT system.  The power piston has a steel post on it that engages with a piece in the baseplate with is adjusted up and down with the center screw. 

I like to modify those carburetors with an external screw when I build them here to provide full control of part throttle A/F from rich to lean without having to take the carb apart and change metering rods.....Cliff

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