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Most of my info came from the LS side of things, where titanium valve springs were combined with aggressive cams - high rpm, high lift, steep ramp angles, and so on.
I'm starting with 7k rpm and may move to 7200 rpm. I don't plan to go beyond 7200 rpm due to harmonics and premature wear issues. I've seen some M54's rev to 8k rpm, and engine life was short with a lot of bore scoring.
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