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How do I adjust a holley carb.

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by RingMaster4x4, Dec 2, 2002.

  1. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    I need to know how to adjust a Holley Double Pumper w/ mechanical secondarys? I am compleatly ignorant here /forums/images/graemlins/confused.gif. Any info. will be greatly appricated.
     
  2. chevyracing

    chevyracing 1/2 ton status

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    Adjust what? Float level or mixture........
     
  3. Robin

    Robin 1/2 ton status

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    Summit sells a good book for $14
     
  4. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    I need to adjust the mixture. /forums/images/graemlins/1zhelp.gif
     
  5. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    Thanks I will look into it.
     
  6. 69K5

    69K5 1/2 ton status

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    if its running rich there are two screws at the bottom front outside corners that you use. mine have the tips of the screws painted red. chiltons and haynes have manuals at autozone go up there and borrow one.

    nathan
     
  7. blueturd

    blueturd Registered Member

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    Holleys have a three part adjustment. The screws on the outside will adjust idle and to some degree transition rates. The power valve, if functioning properly, adjusts during acceleration. the jets in the front and back are the main mixture adjustments. Your best bet is to go to a good bookstore, library, or speed shop and obtain a copy of a holley guide book. Otherwise, junk the bastard and use a Q-jet!
     
  8. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

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    The best way to adjust a holly is to replace it with an edebrock.

    lol
     
  9. ChevyDrivnRdneck

    ChevyDrivnRdneck 1/2 ton status

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    AGREED!!!!!! /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  10. rrent

    rrent 1/2 ton status

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    I've run Holley for years - so if you decided to junk it drop it in a box and send it to Texas.

    If you are running rich at idle or can't get the adjustment screws on the side to do anything - take the carb off and look in the primary bores - there are two small slots (one per side) these should not be exposed - if they are you've got the idle adjustment (screw that holds the butterflys open over by the throttle linkage) close the butterflys to just start to cover these and then don't re-adjust this screw. When re-installed the idle mixture screws on the side should adjust the idle. If you can't get it to run like this you may have to take it off again and open the secondary butterflys just a bit to allow a little air in. There is a small screw from the bottom to open these.

    The books tell how to restrict the idle passages, but I could explain it here without pics.

    good luck
     
  11. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    I will not get rid my Holley. /forums/images/graemlins/mad.gif I will try to adjust it again I will let you guy know how it goes. Thanks
     

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