yeah, the symptomes for a bad headgasket is there, but i think its wierd somehow, considering that the compression pressure is much higher than the boost pressure...

had the problem sometimes last year too, but i think it is getting worse now, not sure...

but will try to set 2.0 bar to the inlet manifold later today, see if this changes anything in the header tank.

was sort of thinking if the inlet runners in the head could have a crack or something, blowing the boost pressure into the water channels.

i'll gues i just have to investigate some more after work

cheers!