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I am assuming this for a hydraulic valvetrain.
There is hot lashing, and then there is cold lashing.
Hot Lash (this will make a mess)-
With the motor running loosen the rocker arm until you hear it clacking, then tighten it until it quits.
Cold Lash-
Make sure you are on the base circle of the cam while adjusting the rocker. Tighten it to the point of zero lash (you can feel it by spinning the pushrod between your fingers, as soon as you start feeling resistance you are at zero lash). From there add an additional half turn for the preload.
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