Re: Holley 94 air screws
well ive heard of it but never seen it. The marks on the screws are alignment marks and face upwards when the screws are bottomed out then a groove is cut to give a predetermined permanent opening [ie idle jet] this is used to keep fuel flowing in the carby and keep the bowl supply fresh so stopping secondary carbs fouling up with stale gas when not in use dont know if it works but thats the theory
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