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Technical Holley baseplate question

Discussion in 'The Hokey Ass Message Board' started by Racer29, Feb 3, 2025.

  1. Racer29
    Joined: Mar 13, 2007
    Posts: 1,646

    Racer29
    Member

    I was having troubles with my car idling. I had to get way too far into the transfer slot to make it idle and then obviously it’s way too rich. I got to looking at the base plate and it didn’t appear to have idle circuit holes in the base plate. I looked at one of my parts carburetors and it did have idle circuit holes in the base plate. So I swapped out the base plates, instantly got my idle back and I have idle air mixture adjustment now that I didn’t have before.
    Any thoughts. The picture is of the base plate that I could not get the car to idle with.
    Any thoughts?
    IMG_2097.jpeg IMG_2095.jpeg
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 60,040

    squirrel
    Member

    650 spread bore?
     
    jimmy six likes this.
  3. Racer29
    Joined: Mar 13, 2007
    Posts: 1,646

    Racer29
    Member

    Sure is.
     
  4. Racer29
    Joined: Mar 13, 2007
    Posts: 1,646

    Racer29
    Member

    IMG_2095.jpeg

    The red dots are where the idle circuits should come in.
     
  5. Do you know any background history of the carb? ....As in, did it run acceptably in the past in another vehicle?
     
  6. squirrel
    Joined: Sep 23, 2004
    Posts: 60,040

    squirrel
    Member

    maybe it's still around because it doesn't work, and never got any miles on it? :)

    I had a few of those back in the 90s, they liked to leak at the staked plugs, so I tossed them in the garbage. Quadrajets always worked better for me.
     
  7. Racer29
    Joined: Mar 13, 2007
    Posts: 1,646

    Racer29
    Member

    It’s what I’ve always had. For some strange reason I like them but have never ran into this particular problem.
     
  8. Racer29
    Joined: Mar 13, 2007
    Posts: 1,646

    Racer29
    Member

    The guy I bought it from said he had it on a car for a little bit and then went fuel injection.
    I’m guessing because he couldn’t get it to idle.

    It works and idles great now that I swapped baseplates.
     

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