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16. Once the solid or modified lifters are installed, assemble the rest of the valvetrain on that one cylinder and set the valve lash to zero. Essentially, you want to adjust the rocker until there is a slight drag on the pushrod (spin it with your fingers as you tighten the rocker arm)—you don’t want to pre-load the valve spring. You can then continue with standard piston-to-valve clearance checking steps.