I was curious if anyone has knowledge of vlave settings that may be more ideal for nitrous. On my recent service, my valves were adjusted. My mechanic said he tightened them more than usual because he knew that I was going to be putting NOS in it. He also said that if I was putting a SC on it, he would leave them looser than normal. Is this a good idea and how do tighter valves it effect the engine for everyday driving in the long run?