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it is hard to say what the max it will take is. Personally I think that nitrous is safer on the motor than a supercharger, so I feel more comfortable at these levels on spray than a SC.
I think that this set up will last as it sits, I would like to see 700 with the second stage for now on the stock bottom end but do not expect it to hold for very long. Mostly being concerned with the rods when the nitrous hits.
I may build the motor before it gets to that point!
Which plugs are you using? What are the rpm limits on your window switch? Did you put in a Boost-A-Pump that boosts pump voltage when the nitrous solenoids are powered?