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Q-Jet tuning

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  • Q-Jet tuning

    Moving on from the timing to the carb. I remember from a previous life, we set up the carb with a vacuum gauge. Similiar to the timing. Set the idle screws for the best vacuum. I believe that on a Q-Jet that was something around17-19. Anyone know what I'm talking about, and can I do this?
    1988 26' cuddy
    1975 20' open
    16' Sandpiper
    14' Certified Fiberglass

  • #2
    Haven't done a Q-Jet since the early 70's. I went for the max vacuum and 17-19 seems right, maybe even 21, but guessing that value would vary with engines. Hopefully someone more current will respond.
    C Rhodes
    26' Mackinaw - 1990
    351 Indmar (1990-2006: Great Engine)
    351 PCM (2006 - Current)
    Southport, NC

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    • #3
      https://www.dropbox.com/s/ozhbdpplab...anual.pdf?dl=0
      I think it’s in here. Just don’t have time to look now.
      '78 20ft Cuddy
      Mercruiser 350 FWC preVortec w/Carb

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      • #4
        Set at 18. Best I could do. When you go back to basics, it gets simple.
        1988 26' cuddy
        1975 20' open
        16' Sandpiper
        14' Certified Fiberglass

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