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Thread: Holley 4150 HP idle air bleed change refresher course.

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    central Illinois

    Holley 4150 HP idle air bleed change refresher course.

    OK, need a refresher.

    If I have throttle blades set with approx. .040" idle slot showing below blades, and my 4 corner idle screws give best idle at only 1/4 turn from full in, am I lean or rich?

    Will changing the air idle jet sizes allow adjustment to 1 1/2 turns out on screws and will this be any better idle quality than the 1/4 turm out?

    Bigger idle air jet will lean fuel/air mixture?

    What else is there to getting better idle quality?

    377 SBC with .520 hydraulic roller cam, 750 HP carb, 21 degrees initial and 38 degrees total timing, 7-8" vacuum at idle, 1000 RPM idle in neutral, 800 RPM in gear, 3500 RPM converter.

  2. #2
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    Rich, go the next drill size larger on the idle air bleeds.
    Mark Whitener

    Good work isn't cheap, and cheap work can't be good.

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