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 will beat ring lands off pistons faster than you can replace them