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That just looks like normal wear for the miles to me. The 6 #3s are probably factory bore sizes to match pistons when new. It might have got warm a few times causing bore wear. All the markings on the outside of the block look similar to what I have seen on Japanese engines over the years. If it is flat and round, get a pro power hone job and the correct rings and run it again.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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