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Your crankshaft. Even if after spending hundreds (or more), don't assume it was manufactured or rebuilt to spec. It should be double checked for straightness, journal runout, out of round and size. An engine builder should perform those checks as a matter of SOP (standard operating procedures).
Do not assume parts received are ready to install. If you don't, you should have a pro do it for you, or assume it was performed, then accept the consequences, if any.
Sherwood
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