Drop a line to KB. They make the pistons and they can tell you. I wouldn't put NO2 on anything but forged.
All depends on ring gap the keith blacks like more so with the nos its going to have to be real wide so they don`t swell into each other. We had a 150 shot and had no probs but keep in mind to increase the octane in your fuel and retard timing to. Those keith blacks really don`t like detonation
100 shot? I was leaning towards a 100 shot and how much doe's compression factor come into this? Is the Edelbrock RPM kit a good place to start?