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The springs themselves will be ok to around 8500rpm, with std valves.
They are however limited to about 11.4/11.5mm lift depending on the casting.
It is also not advisable to take hydro's past 8000rpm.
Std Rods/bolts/pistons are seamingly ok to 8000rpm also.
They do respond well to cams, and headwork. They are a very lively engine, but have lived in the F7R's shadow due to the inherent higher levels of torque with the 2.0.