i'm assuming where it says "skunk2 valve seals and retainers" you actually meant to say valve SPRINGS and retainers... if that's the case then you should be good to go; the GSR bottom end should have no problem revving that high... you just need to tune it, and be aware that the honda ecu fuel map cuts out at 9000 rpms (above 9000, it sprays in whatever the value is at 9000), so what i do is dump a bunch of fuel in leading up to that point and then it leans out past that. not an ideal solution, but it works and still makes good power without ever getting dangerously lean.