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Well, borrow or rent an inside micrometer or get a set of the adjustable measuring "T"s and be sure you have a micrometer large enough to measure these tools. 3" is a pretty large micrometer. Check the bores and see what you have. I do feel like a lot of folks needlessly fret over bore surface having to be near perfect. Even race engines are run with wall marks and the like.
Looking forward to seeing details and curious what you find in/on the rings...
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84 944, 87 Vanagon, 88 Mitsubishi Van Wagon, 88 Supra Targa, 1990 Audi 90 20V Quattro sedan, 1992 Lexus LS400, 1993 LandCruiser, 1997 LandCruiser, 2017 Subaru Outback.
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