Thanks for the advice, obviously my bike is not normal. But the gaskets are correctly fitted and the threads are clean. There is quite a bit of thread still showing, about 1cm. I'm starting to wonder if the head had some bodged work done on it some time in the past. Strangely enough it's the exhaust nut that does all the way up that I'm having problems with. The one with the excess thread seems to be sealing OK.
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