Nitrous Oxide is very hard on your piston rings, connecting rods, head bolts, head gasket, etc... When nitrous oxide is used it greatly increases the amount of heat and pressure in the combustion chambers, which can overstress the metal. If its used on the m42 or any engine, it probably wont hurt the engine the first time, but after a few times it could have negative effects. Here’s something I heard one of my friends say... Babies get bottles, Men get blown.