Recent content by Islander221v

  1. I

    Hole in rear of head on 3.7l 1988 Mercury Marine motor

    Thanks for the quick reply, $8 frost plug at NAPA,
  2. I

    Hole in rear of head on 3.7l 1988 Mercury Marine motor

    Hope some knows. There is a round hole in the head at the end beside the rear lifting hook. It appears to be about 9/16" around. At the front end of head there is the same size whole but it is plugged, does anyone know what these are for, the rear whole has air coming out of it.
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