If you're going to keep it down around 6000, then I would feel somewhat comfortable with them.
Just remember, even if the cam peaks at 6500, you need to shift at around 7, and you don't want the valves floating while you're trying to get there.
Always pick the cam first, then make sure all the other parts match it...
That way you don't run into coil bind issues, spring pressure issues, etc, etc.
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