Holley fuel inlet thread size???? Please Help!!
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Holley fuel inlet thread size???? Please Help!!

  1. #1
    Living in a cage of fear thatguy's Avatar
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    Default Holley fuel inlet thread size???? Please Help!!

    I need a couple fuel inlet adapters for the new 6109's I built.
    They have 4 side hung primary bowls.
    I am placing what I hope is my final order for the last little stuff and I do not know what the thread size is for the bowls.

    The OD of the threads for the 2 6AN fittings I have that fit are 0.555 on the thread OD.

    The ones I am looking at on Summit do not state what bowls they fit.

    What is the thread size for the Holley side hung bowls??

    I'm thinking it is the 9/16 24 ??

    Thanks!!
    Last edited by thatguy; 07-02-2011 at 06:18 PM.
    Tommy
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  3. #2
    Senior Member Oldsquirt's Avatar
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    All of my Holley's use a 7/8-20, but there are also fittings listed for Holley that are 9/16-24, which is what your measurement would appear to translate to.

  4. #3
    gn7
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    7/8-20 = center pivot bowls dual feed 4150 carbs (like double pumbers and Dominators)
    9/16-24 = side pivot single feed 4160 carbs (like 660, and 1850) the 6109 requires two fitting per carb. Also fits Q jet



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  6. #4
    Living in a cage of fear thatguy's Avatar
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    Thanks Guys!

    I have a Holley 4150 on the shelf with center floats and it has the bigger inlet (7/8")

    I converted the metric ones to decimal (in.), nothing was close to that OD, the 9/16 24 is the only one that was even close.

    Thanks again for confirmation!!!
    Tommy
    Quote Originally Posted by Rexone View Post
    Tommy please remove all Jimsplace quotes from your sig and don't put more back. He doesn't like it and it is against the rules. Thank you.
    "So as through a glass, and darkly
    The age long strife I see
    Where I fought in many guises,
    Many names, but always me."

    Gen. George S Patton

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