Nitrous plumbing A1A...??..

and here's something I read earlier which is good info and along the same lines but with a bit more added info:)>

Nitrous doesn't care what octane rating the fuel is. The TIMING is what matters. The lower the fuel octane, the lower the timing you run.
Nitrous drastically increases the efficiency of the motor, by creating a quicker and cleaner burn. The quicker and cleaner the burn, the less spark lead the motor needs. No different than a motor with poor heads needing 40* of timing to run hard and when you put a better head on it, then it only needs 32* to run hard. You have made the motor more efficient. Timing does NOT make power. Timing is only when you light the fire in the hole in an attempt to have a complete burn by about 15* ATDC. When you think about it, advanced timing is fighting what you are trying to do. The sooner you light it, the more the motor has to overcome in the increasing cylinder pressure of lighting the fire early. In a perfect world, the closer to TDC you could light the fire and burn it completely by 15 after, the more power you could make by freeing the motor up. Unfortunately engines are just not THAT efficient yet. Don't put timing in until it slows down and run the max you can. Pull timing OUT until it slows down. If it runs the same at 36* as it does at 40*, the latter is doing you no good and only increases your chances of pre-ignition.

TIMING is what destroys nitrous motors NOT lean. With enough timing out, you can't get one lean enough to hurt it. It will just be down on power, like any other vehicle that is lean. No fuel, no power.
Too many are under the impression that timing MAKES power, it does not. Timing, or spark lead is just where you light the fire based on the efficiency of your engine to get a complete burn. The combination is what makes power, NOT how much timing you run in it.
The "old school" way rich tunes seemed to stand more timing, simply because you were not making near the power you thought you were, because it was dead rich. Way rich, with big loads of nitrous this will beat ring lands off pistons faster than you can replace them.
A nitrous motor of any kind always responds to plenum volume
A piston with the top half burned is strictly too much timing
Take plenty of timing out to be safe enough. If you are not detonating its harder to hurt it. Rich tunes are not safer tunes. It's nearly impossible to hurt something running too lean. If you are detonating like crazy and stuff is about to melt, well you might hurt it. But, lack of fuel didn't do this. Detonation got it.
On new stuff start with a really lean hit. Run engine timing as low as possible and with a nice lean tune in carb. Pull plenty of timing. 2 per 50hp (not necessarily the rule today). Another 4 if you have a small quench, less than .040”
To tune from here. Trim fuel pressure to see if you pick up mph. If not put it back. Take another degree of timing out. If it don't pick up put it back.
Add a degree of timing, try again. Key thing is if the mph quits picking up put it back. New plugs pushed in the lanes and cut off at end of pass will give you the best reading.:thumbsup: