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The 5 mm ball that I found was in the sump of a CA company rebuilt engine with lots of red painted parts. Less than 200 miles on a total rebuilt mag case engine that had not been line honed or bored. Much main bearing material in the sump along with the 5 mm ball. Since I know of no ball bearings in a 911 engine, I thought that the rebuilder might have put it in the sump as a joke. No surprise since the rest of the "rebuild" was a joke.
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