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How Carburetors Work

On a modular Holley architecture, the idle and high-speed air bleeds are located next to the boosters. Larger bleeds lean the air/ fuel mixture and delay fuel delivery, while smaller bleeds richen the mixture and initiate fuel flow earlier. Carb manufacturers advise against altering air bleeds since tuning with smaller or larger jets is much safer and more forgiving.
How Carburetors Work - Carbin' It Easy

On a modular Holley architecture, the idle and high-speed air bleeds are located next to the boosters. Larger bleeds lean the air/ fuel mixture and delay fuel delivery, while smaller bleeds richen the mixture and initiate fuel flow earlier. Carb manufacturers advise against altering air bleeds since tuning with smaller or larger jets is much safer and more forgiving.  View Related Article

 

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