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Fast Idle Screw size/thread pitch


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My truck currently does not have a fast idle adjustment screw, and I would like to get one in there. The screw fell out some time ago, and I was wondering if anyone could pull one off of an old carb they have and get the thread pitch/size for me. It’s probably M6 or M8 x1.25. I would just go to the store and buy a few screws to see which one fits, but  the fast idle cam is hard to get at with the carb on the manifold and I’d rather not mess around trying to fit a screw that’s too large in the hole. 

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