OK so no one actually answered you question. You can rev the bottom end as high as u want. The limiting factor is your valvetrain AND horsepower. Most aftermarket heads come with springs that can handle 6500 rpm safely. 260hp at lets say 7500 rpm should b fine cause you're not taxing the bottom end that much with only that much power. Switch to a solid roller cam with matching springs for what ever rpm u desire. Assuming that u have a road course tranny with 5 gears where there is no overdrive, u will need to keep the revs up for better lap times and performance. Hard part with road racing is that constantly downshifting the tranny causing the motor b used as a braking method will contribute to damaging you motor even if the revs are safe. So there u have it, valvetrain will determine max engine rpm but keep in mind that HORSEPOWER will determine BOTTOM end rpm.
