i took it further apart...unfortunately some debris got between piston and cylinder 7 & 8....time for a complete rebuild. it´s .030" over already...hope that it´ll clean up at .040". We´ll see, will tear it down totally and then starting to make a plan.
strange thing i found: the heads are o-ringed, the wire is still there. Used with a conventional head gasket, no copper.....it seems that at least this did work.