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The failure mode on aluminum is still going to be more severe than a ferrous metal, but either way you've lost an engine. So it really comes down to whether it's more likely. I'd guess it is, but if someone suggests they won't be the first part to fail, I wouldn't doubt them either - just because it may fail sooner doesn't mean it will fail first, and in an engine built toward the limits, that's really what you get to balance.
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