The springs have a twisting action made into them it is how they are. The keepers and valve grooves have very little with not letting the valve twist. The rotation action helps keep the valve and seat clear of debris to ensure good sealing and even wear. Yes some of the older engines and aircraft have rotators on the exhaust, not many cars that I am aware of......
Wow that is very interesting didn't know they rotated like that. So I read alot of ppl ditch the rotators when they build there heads is that a bad idea? After seeing that maybe we should keep them?
