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My guess is in stock form, with the el-cheapo bolts needed to keep their retail prices low, neither could handle the RPM needed to make 1000HP for very long... put some better bolts in them, and they would have a better chance though. I would not use either in anything expected to spin above 8000 RPM. This does not mean they are "junk" for all practical purposes, it just means they would not be sufficient for the stresses involved at higher RPMs.
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