Ohhhh..... It has a standard bore on one side, and .010" over on the other?
Unless you don't put many hours on it, I don't think it will last "a long time". Twin cylinder with one hole larger than the other will cause issues. One will work harder than the other, one will run rich the other lean.... so one cylinder will tend to run hotter than the other. Might last a while, but depends on how hard you use it, and how well you tuned it. Keep it clean, and hope for the best.
As a note to others: Always match bore sizes.
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