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For road race use I would keep it below 15 psi like Ted said. 6800 rpm is no problem. For street and drag use we do send them out the door at 16 psi though. We had a shop ZL1 we did testing with and had no problems with those power, boost, and rpm levels for street use on 93 octane. That package on a pump/race gas mix we've pushed to 17 psi and 6900-7000 rpm. That will do 830 whp and high 9's on a drag radial in a full weight car. The 2650 really allows you to be little more aggressive with theses lt4's with proper tuning. So dialed back to around 700 whp will be a reliable road course setup.
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