Mismatch Air Bleeds on 2 4781's
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Mismatch Air Bleeds on 2 4781's

  1. #1
    Half a bubble off jrork's Avatar
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    Default Mismatch Air Bleeds on 2 4781's

    Hey guys. I'm putting my motor together and just noticed the two 850's I picked up recently appear to have the airbleeds sized differently between the carbs.
    How totally screwed am I?

    These are not anything special but I was just planning on stuffing a kit in them and jetting for my application but now It's got me wondering if a new mainbody is in my future..

    Be gentle on me for my ignorance.....john

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    Cantard 71hallett's Avatar
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    How many sizes are they apart? If its only a couple drive on!!

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    Well, I attempted to measure them and have the following info

    .070 vs. .063

    For the small bleeds, I don't have that small of a drill but both carbs bleeds are less than .040.

    These are the stock press in type and one of them is buried down in there a ways (not like the other that is flush, ie factory looking)........

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  6. #4
    gn7
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    don't sweat the small outside ones, they are idle bleeds. what is the suffix number after 4781 on the choke horns -1,-2? God only knows why holley does what they do with revisions. What are these going on, a t-ram?



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    Quote Originally Posted by gn7 View Post
    don't sweat the small outside ones, they are idle bleeds. what is the suffix number after 4781 on the choke horns -1,-2? God only knows why holley does what they do with revisions. What are these going on, a t-ram?
    Cool, you just saved me some money. Thanks so much.

    They both are 4781-2 and they are going on a little blower motor for my motorized airmattress (18' Brendella) 8-71 468 BBC

    All be back for jetting recommendations for a mild puffed motor that runs primarily in our cool air up here at sealevel.

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    gn7
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    if they are going on a blower don't even worry about it, that damn blender will even every thing out anyway.



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    Quote Originally Posted by gn7 View Post
    if they are going on a blower don't even worry about it, that damn blender will even every thing out anyway.
    GN & Hallett, thanks very much for the quick response and help.

    I really appreciate it. John

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