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Carb jetting help

Discussion in 'The Hokey Ass Message Board' started by lippy, May 18, 2010.

  1. lippy
    Joined: Sep 27, 2006
    Posts: 6,864

    lippy
    Member
    from Ks

    A friend of mine has a 56 Ford with a 292 in it. He has a 4bbl off a 289 mustang on it. It's the holley look a like deal. 4100? Anyway, he says it has 42 primary jets in it. What is a normal primary jet size for a 292 with a 4bbl. His had a teapot on it originally. And yes, he put a new powervalve in it. And yes the floats are set right and it has just been kit'd. The timing is right also. Just chasing a rich at idle condition. Thanks, Lippy
     
  2. Deuces
    Joined: Nov 3, 2009
    Posts: 26,129

    Deuces

    I'd play with the idle mixture screws first before doing any jet changes... Hook up a vacuum gauge and adjust the screws to get the highest reading.
     
  3. lippy
    Joined: Sep 27, 2006
    Posts: 6,864

    lippy
    Member
    from Ks

    Done, still fat. Thanks Lippy
     
  4. merf
    Joined: Jul 24, 2008
    Posts: 105

    merf
    Member
    from new joisey

    If both screws are turned in evenly is there any idle drop at all?
     
  5. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    tommy
    Member Emeritus

    The main jets won't affect the idle mixture.
     
  6. carbking
    Joined: Dec 20, 2008
    Posts: 3,893

    carbking
    Member

    Agree!

    Jon.
     
  7. REM/Mo
    Joined: Feb 24, 2008
    Posts: 281

    REM/Mo
    Member
    from Missouri

    What indicators of rich mixture at idle do you have.

    A vac leak can cause a mixture problem that many diagnose as a rich mixture by the exhaust.
     
  8. lippy
    Joined: Sep 27, 2006
    Posts: 6,864

    lippy
    Member
    from Ks

    Black pipes and smelly. Fellas, I'm going to run over there later and get some more info from him and post again. And part throttle is rich too he says. Damn gas engines. That stuff is for cleaning parts is what I told him. LOL. Lippy
     
  9. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope
    Member

    If he still has the original distributor it won't run right anyway. A later Y-block dist. has the mechanical advance that will work with the Autolite carb. Look for one out of a '60's pickup.
     
  10. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    tommy
    Member Emeritus

    Very good point. The 56 Distributor needs the 56 carb to work the funky vac advance correctly. Get a 57 up dist.
     
  11. This is true but it will just make it run like a dog not rich. Ie it hasn't been changed out you can get the later dizzy at any parts store just ask for one out of any '60s F-100 then hook to ported vacuum

    I agree with this too. If it is only fat at idle check mixture screws and float level. I know you said it's been done but it's all I have for you without looking at the carb. :rolleyes:
     

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