Re: GAV Setting
The early Zenith carburetors had a screw-in brass GAV valve seat in the base of the GAV tunnel. Ford eventually did away with them because many people would close the valve tight. The needle valve is also brass. Brass on brass has a tendency to seize. The result was the needle seized in the brass seat, and when the driver tried to open the GAV it unscrewed the valve seat.
The brass valve seat looks very much like the comp jet. Often people have installed the valve seat where the comp jet is supposed to be. The result is GAV control is negated.
If you leave the brass GAV valve seat out of an early carburetor, the GAV control is also negated.
Tom Endy
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