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  1. 69'Net

    Holley carb Air/fuel mixture

    I have a 770 avenger on a 440/auto. The idle mixture screws were set on a Dyno with an air/fuel gauge. I had to send the carb back to Holley to fix a crack in the casing. Now I'm having idle issues. I tried to adjust the screws with a vac gauge but the vacuum is unresponsive when I turn them...
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