100 horse shot of nos for 440?

You can use a 500 horse pro shot fogger on it as long as you make DAMN sure it does not run lean. That is what kills a nitrous motor. But to directly answer your question, 100 HP is fine. Again, don't lean it out. You see all them nitrous boys leanin it out to make it run as fast as possible. That's a mistake. I always run a nitrous motor rich. If it is built to take it with good rod bolts and premium rings and a steel crank, it will live with stock cast pistons as long as it doesn't lean out. Fat man. Real fat.