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Old May 8th, 2006, 10:23 PM   #5
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The old 340 "X" blocks, so it says on the paper work, can be bored .060 over and still reliably run 2.5 horsepower per cubic inch. The newer 340 blocks from M.P. are siamesse bore. I don't know much about them other then listening to how bad my brother wants one:tonka:
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