Hello folks, recently my dad has purchased a 1968 dart gts 340 with a carter avs 4425s that when adjusting the center screw the rpms will not increase or decrease. We are curious on why nothing occurs when adjusting the screw. We have adjusted carter 2 barrels with good luck, but those have two adjustments. As far as we know the engine was rebuilt to factory specifications. If anybody can shine some light on what the problem could be it would be appreciated.
