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Everything that I've read says that it has a lot to do with the temperature that the engine has run at over its life. The presence or absence of an external oil cooler and how and where it has been driven all can make a difference. Has the engine ever pulled any head studs? If yes, this could be a clue of overheating in the past. Also, before thinking about splitting the case, you can remove the rod bearings and inspect the crank journals and the bearing shells. This should give you a clue if you need to delve any deeper.
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