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Without going back through all these posts, a question.
Why did you put that copper stuff in the cooling system, did you have an issue with the head before?
I don't understand all the to-ing and fro-ing when there probably was a pre-existing problem that you knew about.
Just seems like a good starting point of the diagnosis that was ignored, or have I got the wrong end of the pineapple?
Nearly a month and 400 plus posts, must be doing your head in. Good luck with the power ball, I'm told you must buy tickets first... bugger.