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The Crower shaft rockers come with this setup system to shim the rocker stands for optimum geometry. When the "mock-up" rocker sits on the fulcrum with the valve stem tip at the top of the gap, the rocker pivot height is set properly. Unfortunately, if the valve stems are not exactly equal, a compromise must be made between the two valvestem heights--how do I know this? The Ti exhaust valve stem has a "cap" on the end of it to protect the tip from excessive wear, which threw off the heights.