All the OEM engines will spin faster than they can breathe- I'm guessing the bottom end will take 7500 or so on any of these without issue. The real issue is spending that much time bouncing on the rev limiter. Oil pump cavitation (or downright breaking gears like the Ecotec is known to) and valve spring fatigue will end up being the big issues with this engine format (shimming an OEM spring is not the same as an aftermarket spring, folks).

I doubt you'll ever see a rod break without a bearing showing oiling issues.