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Reply to "Build Your Own 91 octane, 500 HP, 377CID CLEVELAND?"

Mooso, "ten under" means the crank was reground to ten thousandths of an inch under it's original diameter. This is pretty common when rebuilding the bottom end with new bearings. It just cleans up the surfaces to a like new bearing surface. I don't believe there is any performance gain(others may know better).
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