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The GAV setting is dependent on the sizing of the comp jet and the cap jet. The setting of the GAV will be different from car to car. If the two jets are flowing within specifications the setting of the GAV should be a nominal 1\4 to 3\4 open. The comp jet has a small flow and a narrow window. It ports fuel into the secondary well where the cap jets draws its fuel. The cap jet has a much larger flow rate. The GAV valve is a means to port fuel around the comp jet into the secondary well. If the comp jet has been drilled out to the same size as the cap jet, the GAV then has no affect no matter where it is set.
Tom Endy