472 vacuum diagram

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500, 472, 425, 368 Discussion, 472 vacuum diagram in Cadillac Engine Discussion; well i have these vacuum lines and idk where they go on the carb can anyone help me out...
  1. #1
    1969cadillaceldorado's Avatar
    1969cadillaceldorado is offline Cadillac Owners Fanatic
    Join Date
    Mar 2006

    472 vacuum diagram

    well i have these vacuum lines and idk where they go on the carb can anyone help me out

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  3. #2
    man1ey's Avatar
    man1ey is offline Cadillac Owners Member
    Automobile(s): 1968 Deville Convertible
    Join Date
    Aug 2005

    Re: 472 vacuum diagram

    Here's how mine are laid out on a 68 Deville 472 w/ AC:

    Starting at the 12:00 position looking down on the carb from above:

    12:00 to transmission (hard metal tube coming up from beneath firewall
    4:00 to vacuum switch, driver's side of distributor
    6:00 to PCV valve (large line)
    7:00 this one's a pain: line coming from carb 7:00 position and line coming from pull-off diaphragm come together in a T. Third line comes from T over to vacuum switch in to driver's side of distributor.
    10:00 yellow stripe coming in from hvac lines to idle speedup diaphragm.

    Hope these help - I know they could be a little more descriptive but I'm going from memory and can't scan you a pic of the manual right now.

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