Mine pulls hard all the way up to 8k if I want. I'm sure some will argue that my tack is out of calibration. And here's a vid of another guy hitting 8k in his. I'm not saying it's a good idea to do but it is what it is. With a fidanza flywheel and top end porting it raises the rpm cieling another 1000rpm's
http://www.youtube.com/watch?v=E0Egy...1&feature=fvwpI'm sure in short bursts it won't hurt anything but I would'nt keep it up there.