This is the only other pic I have, I can get more tomorrow. The dark line between the piston and cylinder wall on the exhaust side (right side of pic) is not a shadow, its a gap with the worst part being right in line with the exhaust valve. The other half of the piston is tight to the wall. When the piston is at TDC the gap is gone, it is tight to the thick area of carbon at the top of the cylinder. It really looks like the edge of the piston is eaten away.
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