@lat 64
Thank you! That does make sense. It isnt a very loud sound, its very subtle. Would preforming a compression test confirm the exhaust leak issue?
Also would disconnecting the spark plug wire stop the sound?
Past history: When i first got the boat/engine (Apr 2018) i had an overheating issue. Found out that it was the stern facing L was clogged with gunk. Cleaned it and the overheating issue when away. Correct my assumption but is it possibly that the pressure build up caused by the blocked L (water and exhaust) put pressure on the exhaust manifold and the gasket causing this issue to eventually happen?
I took a few more screen shots of my exhaust manifold. To show the soot towards the back
https://drive.google.com/open?id=1nA...DOEpLSBq0zmsvZ
https://drive.google.com/open?id=1V2...SDilj7-ZYQ8wNo
https://drive.google.com/open?id=1Uh...Wq2Yvk11dqyFwp
Thanks all!
Chris