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It depends how many times its been re-bored. If its .060 over now with 50,000 miles on it theres not much left. A .030 is fine as it can take a.040(.010 more) next time and maybe a .060(.020 more) over at the most depending on the casting number. Many don't like .060 over due to heating problems. At least this is how I determine a blocks worth. FWIW.
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69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint
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