Since you talk about springs and balls you have a Rotocap type of valve rotator.
The reason to use them is to rotate the valve face a little bit each time it opens to help scrape off any carbon deposits that can form on the valve face and seat. This is why the normally are found only on the exhaust valves, not the intakes. They can be checked by tapping on the end of the valve stem once it is assembled in the head. You should see the valve rotate just a bit each time the valve opens.
Incidentally, if an engine is running on propane the rotators should be removed or disabled. Propane does not leave carbon deposits and the rotators will cause increases valve face and seat wear.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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