Dauntless passenger exhaust manifold hole - what the heck?

Discussion in 'Jeeps with the Buick Heartbeat' started by dnb5853, Nov 24, 2021 at 1:16 PM.

  1. dnb5853

    dnb5853 Member

    This is a CJ5 Dauntless passenger side exhaust riser for the air cleaner. The heat valve no longer works, so I don't care about that!
    WHAT IS THE approximate 3/8" DIA hole for that is in the second photo? This is on the lower part of the manifold and faces forward.
    There is a matching hole in the manifold. What is the purpose of this hole? All I find about thermal carb choke support tubing is a 3/16" DIA hole (half the size of existing hole).
    I ignored this hole with my remanufactured engine install as it seemed moot. Apparently the manifold was plugged <?> I did not remove this exhaust shroud as those two small screws were fragile! Obviously, they broke upon recent removal.
    Trouble shooting info: I was driving home and upon light acceleration, all of a sudden, I heard a loud HISS. It sounded like a semi truck air brake application...but no big truck around. It was ME! It was clear an exhaust leak was occurring but not just a single cylinder. If there was a manifold plug, it must have fallen out. I'm going on 4+ years of my engine replacement with no other issues.
    Help me understand what this manifold hole was originally intended!
    I've stumped the guys over at EarlyCJ5.com. :confused:


    Thanks all! :)

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