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

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    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
    Location
    Florida
    Posts
    635
    Rich, go the next drill size larger on the idle air bleeds.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

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


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