You can easily get more than 6000 rpm with a hydraulic. A friend of mine has easily hit 7000. Another Pantera owner I know shifted at 7800 and I could easily turn over 7000. Just check the springs you have and make sure you dont have too much oil pressure. If you run 90 psi of oil pressure at high rpm it will pump up the lifters and hold the valves open. 60 psi is fine.
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