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Thread: 750 too rich idle, I know same old dumb question.

  1. #1

    Default 750 too rich idle, I know same old dumb question.

    454 big cam polished heads bottom end stock. New 750 vacuum street carb, all sound not that fast. Seems way too rich at idle & regular cruising with a strong smell of gas. Easy to crank, carb seems clean, no seats leaking, power valve seems good, air screws about 1 1/2 out. To me, seems carb is too big. How do I lean out idle and possibly all RPM? Will main jets change both of these problems? Any help is appreciated.

  2. #2


    I'm having the same problem with a different setup. Two 450s on a tunnel ram. Have you found any info?

  3. #3


    I bought an "extra rich" Holley once. It was sold as a extra rich carb, but no one told me.
    Anyway, Google about wire restriction in Holley metering plate. That's what I did back in the 80s to lean it out.

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