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17 To check and adjust the rocker's geometry, Panhandle used the rollout geometry method, in which the priority is to minimize roller travel across the tip of the valve. A cylinder head has been installed with checking springs and an adjustable pushrod. This allows the rocker geometry to be checked and adjusted as needed along with the proper length pushrod measurement and piston-to-valve clearance verified. On the exhaust valve tip, you can see the witness mark of the rocker's roller tip on the valve.