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I know I'm clutching at straws but is there any water passing through the oil seperator channels if the gasket is not sealed properley? - Just before I take the head off :S
are you losing any coolant/water ? checked the dipstick for signs ?
Also have you checked the housing on the end of the head where the thermostat is ?
As above , not seen a failed headgasket on one either , not on its own without something else causing it.