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mileage

  1. roadmonster

    Holley 600 getting poor mileage

    I've had the same carb for 8 years always getting 15 mpg. Slow start with puff of smoke got me looking at it and the secondaries were wet with leaking gas. Quick rebuild, everything is great now but 12-13 mpg. Carb and gaskets are perfect, float levels, idle, everything ok, but mileage sucks. No...

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