Thanks for your insight. I have taken the manifold of and separated the riser as well. I did stand the manifold on end and filled it with water and overnight it probably leaked a cup of water into the exhaust portion of the manifold. Looks pretty conclusive that there is a hole in the inner...
After discovering water in the oil of my 5L Mercruiser, I drained the oil and filter. Next time out the starter drive broke and locked the starter. Changed the starter and went for a ride all to come back and find the oil was again contaminated. I believe the starter issue was because of...