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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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