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Hillemeyer measures the installed height of the valves, adding shims as needed to get them as close to identical as possible. In a set of 16 valves in the head, not all of them are going to be the same height, meaning the spring pressures will vary, which is unacceptable. Hillemeyer likes to equalize all the installed heights, meaning the forces on the cam lobes will be virtually identical. View Related Article
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