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The trouble is at the bottom end. Drain the oil into a clean pan and analyze for metal bits. Do the same with the oil filter element. Take the sump cover off and look for bits in there. If the bottom end is damaged it doesn't matter what the cylinder looks like as the cylinder is part of the case (unlike the air cooled type which are separate).
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Tony G
10 Porsches come & gone!
1962 Morgan Plus 4 
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