They do two things. neither one of which makes a lot of difference to the engine on a tractor. The first is that they can either increase the spring pressure for higher RPM operation, or repair weak springs to Specific Compressed length pressure. The second is that they have small contact with the spring metal which (in theory) reduces heat flow into the spring. There is not much heat on the spring from either the valve stem (cooled by the guide), or the head, (cooled by water). Thus the oil is likely to be the hottest thing around the spring, and well withing the springs lower critical temperature (at which it will loose temper) Shimming weak springs is OK using good springs is better. Using heavier springs on a Farmall (not a Puller, just a working tractor) is a bad idea, they do not float valves! Cam wear and lifter wear will increase dramatically with heavy springs. Jim
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