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225 V6 Vacuum Line Help

Discussion in 'Early CJ5 and CJ6 Tech' started by Ethan Cerna, Nov 13, 2021.

  1. Nov 13, 2021
    Ethan Cerna

    Ethan Cerna New Member

    Corpus Christi, TX
    Joined:
    Jun 27, 2020
    Messages:
    19
    Hi there. I’m building my first 1968 Cj5 and I need some help on where the vacuum lines go. I have a port off the intake manifold, the vacuum advance, and the carburetor. Any reference photos on a complete 225 v6 would definitely help or just advice. Thank you!
     

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  2. Nov 13, 2021
    boopiejones

    boopiejones I can’t drive 55

    California east bay
    Joined:
    Mar 16, 2020
    Messages:
    379
    On your first image, the small port on the front lower passenger side of the carb goes to the vac advance.
    8C55C15D-7CD6-4FDF-8E07-D9962B12FA9E.jpeg
     
  3. Nov 14, 2021
    Ethan Cerna

    Ethan Cerna New Member

    Corpus Christi, TX
    Joined:
    Jun 27, 2020
    Messages:
    19
    That’s what I had to begin with but there that other small port coming off the intake manifold so I wasn’t sure if I needed to connect that too or just plug it.
     
  4. Nov 14, 2021
    Cj5dale

    Cj5dale Member

    East Tn
    Joined:
    Aug 19, 2021
    Messages:
    190
    I have all 3 ports on the back of the intake manifold on mine plugged.

    The small one goes to the heater and one goes to vacuum wipers I believe. mine has electric wipers. Not sure what the other one is for.

    However, they are handy for connecting a vacuum gauge to though when trying to tune the engine.

    My vacuum advance on the distributor is connected to the vacuum port on the carb as mentioned above.

    upload_2021-11-14_19-4-9.jpeg
     
  5. Nov 15, 2021
    jwmckenzie

    jwmckenzie Sponsor

    Boston, MA
    Joined:
    Mar 16, 2012
    Messages:
    556
    If you have an original heater, the controls require vacuum and you will need one of those connections to operate the heater.
     
  6. Nov 15, 2021
    Ethan Cerna

    Ethan Cerna New Member

    Corpus Christi, TX
    Joined:
    Jun 27, 2020
    Messages:
    19
    Perfect. Thank you everyone for your help! It truly means a lot.
     
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