Coolant seeping from #5 ex. port bolt hole??

Discussion in 'Big Block Cadillacs' started by CaddyCrosley, Mar 6, 2020.

  1. CaddyCrosley

    CaddyCrosley Member

    Jan 23, 2017
    Likes Received:
    McPherson, KS
    There isn't any actively seeping from the hole, but I can't tell if that's because it isn't a leak or if the level in the engine dropped below the point that would make it leak. The freeze plug seepage is a definite issue. I will try hitting the #5 and #3 cylinders with air and listening for leaks from the bolt hole.
    5one9 likes this.
  2. Cadiac

    Cadiac Active Member

    Nov 27, 2004
    Likes Received:
    Wichita, Kansas
    What vehicle(s) do you drive?:
    94 caprice HiPo, 05 Corvette, 02 Chev 2500 Duramax
    If coming out of exhaust bolt hole, highly likely you have a short crack from water jacket to head bolt hole. its not going to a cylinder. One of my race engines does it in three places. got kinda warm at some point. I'm gonna run it till it needs redone. Sucks but won't hurt. Have heard others use a GM additive for a remedy but I don't use that stuff.
    CaddyCrosley likes this.

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