C1 - WCFB vacuum plug adapter - NCRS Discussion Boards

C1 - WCFB vacuum plug adapter

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  • Al C.
    Expired
    • July 31, 1999
    • 274

    C1 - WCFB vacuum plug adapter

    What is the thread size for the vacuum fitting on the back of the rear carb (2627S; 245hp), for connection to the washer system? TIA
    ... Al '58 #378 245hp
  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: C1 - WCFB vacuum plug adapter

    Al -

    It's 1/4" NPT pipe thread. Paragon has the fitting (#755, $15.00). The beauty of the Paragon fitting is that the 1/8" nipple part is separate and threads into the side of the fitting so you can install the hex fitting without removing the carb (for nipple swing clearance), then install the nipple piece. My '57 didn't have washers, but I used the fitting anyway as a vacuum source for carb idle mixture adjustment (as neither the 2x4 manifold or the WCFB's have a manifold vacuum source) and just put a cap on it.

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