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18 Checking valve lash should be an integral part of engine tuning yet few do it. Although 170/200ci Mustang sixes had hydraulic lifters, cam lobes and lifters wear down and proper valve lash winds up lost in the process. We’ve seen some Ford sixes with hydraulic lifters equipped with adjustable rocker arms. Most were non-adjustable, which calls for different length pushrods to take up clearances.