First!!!! You need to make sure your motor will tolerate that much NOS (400 shot). Our Motor is built for Nitrous. Meaning the pistons and rings, etc...are meant for a nitrous application. There is much to learn. You might want to start out with the smaller shot until you have had a chance to ask more questions. Questions are cheaper than burnt pistons, heads, and burgered cylinder walls
The people here have given good advice. You need a colder plug, you need to take timing out. There is a window on nitrous between too rich and too lean- so start small with a safe recommendation. Learn how to read the fuel ring on the porcelin of the spark plug. A nitrous tune up will change with changing weather conditions and will not be the same from day to night. With consideration of a 400 shot, you may want to weigh the option of a fogger over a plate. Each cylinder will accept and burn the fuel differently depending on how it flows. THe fogger gives you more control becasue you can tune each cylinder with more or less depending on how its burning. A plate system dumps into the plenum and goes along with the flow offereing no control over lean cylinders.
A Nitrous motor is hard on pistons and rings, however with careful watch on the tune up, the motor will live. The more Nitrous you use, the more often you should tear the motor down and inspect for needed replacement items. The guys here running 175 shot may race all season. We tear our motor down after every race running 3 foggers and a viper.
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