3 Line vacuum port mounting
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Thread: 3 Line vacuum port mounting

  1. #1
    Join Date
    Sep 2017
    Location
    Colorado
    Posts
    23

    3 Line vacuum port mounting

    Hello All,
    Ok, I admit after years of owning and working on cougars, I ran across something today that just does not compute in my brain.
    On a 1969 with a 351W, why is the 3 line vacuum port mounted to the thermostat housing?? I know I'm older than I was yesterday,
    but for the life of me I just don't understand the theory behind this.
    It's probably an obvious question/answer, but if someone can satisfy my dilemma, I would greatly appricate it so I can sleep at night!!
    Thanks!

  2. #2
    Join Date
    Jan 2005
    Location
    Puyallup, WA
    Age
    55
    Posts
    2,471

    Re: 3 Line vacuum port mounting

    It's called a distributor vacuum control valve. Its purpose is to increase the engine idle speed when the coolant gets up to the hot end of the spectrum. Top port goes to the carb. Middle port goes to the distributor and bottom port goes to the intake.
    Jeff Bingaman
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  3. #3
    Join Date
    Oct 2013
    Location
    Torrance, California
    Age
    62
    Posts
    5

    Re: 3 Line vacuum port mounting

    Thanks to Jeff for the explanation and identifying where the ports connect to. I won't have to ask for this info when I put my carb and vacuum stuff back on!

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