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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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