i think its blowed

Wow, I can`t believe you are turning that kind of rpm on a stock bottom end and hydraulic cam with 550 springs. Somebody is living right. Lol! As Demon416 mentioned, at 8500 rpm you are probably way into floating the valves and way out of the power band of the cam. If you have enough compression you can try the Comp Cams XS282S solid cam with matching springs. Sounds like a comparable cam for what you`re running but without seeing all of the specs on it, I would guess it to be out of it`s power band by 6800-7000 rpm. You might give Comp and Hughes a call and talk to one of their techs. They can guide you to the right cam. It`s what they do and they do it well.