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Buick 231 holes in the block

Discussion in 'Early CJ5 and CJ6 Tech' started by Wrangster, May 9, 2010.

  1. May 9, 2010
    Wrangster

    Wrangster New Member

    Norway
    Joined:
    May 27, 2007
    Messages:
    27
    Hi again guys, have another one I hope someone can help me with. On my new (reman) 231 block there are two treaded holes witch are'nt on my old block. They are right between the frost-plugs on each side, does anyone have a suggestion on what they might have been meant for? Here comes pics: :)

    [​IMG]

    [​IMG]
     
    Wrangster, May 9, 2010
    #1
  2. May 9, 2010
    alex211

    alex211 Member

    Pennsylvania
    Joined:
    Aug 25, 2009
    Messages:
    441
    You can plug those or screw in a coolant temperature sending unit.
     
    alex211, May 9, 2010
    #2
  3. May 9, 2010
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    The one right between the freeze plugs is a block drain.
     
    Patrick, May 9, 2010
    #3
  4. May 9, 2010
    Wrangster

    Wrangster New Member

    Norway
    Joined:
    May 27, 2007
    Messages:
    27
    Ok, thanks!! I think I'll plug them then. I've got a temperarure sending unit on my intake. :)
     
    Wrangster, May 9, 2010
    #4
  5. May 9, 2010
    kaiser_willys

    kaiser_willys Well-Known Member

    Joined:
    Jan 7, 2007
    Messages:
    1,524
    :iagree: and they should have been pluged from the rebuilder. only reason i can think they were not, is if a certain application required them for something else. some small block chevrolets used it for the knock sensor on newer engines, but only one side to the best of my knowledge.
     
    kaiser_willys, May 9, 2010
    #5
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