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Utilizing the intake (1.8005-inch) and exhaust (1.845-inch) valve install height measurements, with a predetermined 1.800-inch install height, valve shims are used to gain the correct overall height. In our case, since the installed height was greater for our exhaust springs we used a 0.005-inch shim combined with a 0.040-inch shim to get a total of 1.845 inches of clearance for the exhaust. No shims were used for the intake valves. Note: some shims are directional.