Rollmaster billet timing set: Nitrided?

Nitriding is case hardening of the surface of steel. I have never heard of a timing set being nitrided. I guess I've not built anything exotic enough to warrant it. Never thought about it. Crankshafts........that's another matter. I can completely see where that would be of use. I have a Rollmaster set for the 225 slant I plan to build sometime in the future. I wouldn't and haven't thought of having it nitrided. It's just not something I would worry about. They are extremely high quality to begin with.