how much nitrous will a stock magnum motor take
so i should start with a 200 shot and add about 10 degrees of timing?
Nah, make it 300 & add 20* lol.
Ok, seriously, I'd start with a 100 shot & pull about 4*, If you run a dedicated fuel cell up front with an elec. pump strictly for the plate, I'm sure you can get away with 150, but i wouldn't go passed that, run 110 in the cell & premium in the tank for the engine, pull a good 7-8* timing, run 1-2 steps colder plugs & tighten up the gap to .028", Use a good race plug, A solid ignition system is always a good idea, The MSD Digital-6 is nice, you can adj. it to pull the timing you want, run a WOT switch, I like running window switches for the nitrous, you can set where you want it to come on/off, its a nice feature. Set the nitrous to turn off about 500 rpms below where you'v set the rev. limiter, this way if something breaks its not still dumping nitrous while your on the limiter. These are just some safety precautions that never hurt. Also run a good tighter converter for nitrous.
