Thanks for the picture, I have just been up to Holyhead to collect the boat. I left her "Chubby" there is the care of Phil the Welder from Anglesey welding. He has modified my trailer to rollers. Cracking job. Anyhow on arrival at home I put the muffs on to give a proper flushing, minded by your previous post I had a good look and found a slight indention in the area under the engine. To cut a long story short a good poke with a piece of coat hanger wire resolved the issue. Many thanks for taking the time to take a photo for me. I can at least breathe easy now regarding cooling to the head. Getting the thing to plane now thats another story.......