Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Dialing in your rebuilt Quadrajet carburetor => Topic started by: boat196 on October 12, 2020, 01:53:29 PM

Title: 7040207 Baseplate
Post by: boat196 on October 12, 2020, 01:53:29 PM

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

Title: Re: 7040207 Baseplate
Post by: Cliff Ruggles on October 14, 2020, 03:41:12 AM

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