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The rocker arm adjuster’s 7∕16-20 NF thread pitch makes each full turn .050”, .025” per ½-turn, or .0083” per hex flat of rotation.

With the rocker arm ratio factored in, the movement is larger: each full turn is .074”, .037” per ½-turn, or .012” per hex flat , and (if using 12 points nuts) .006” per point of rotation at the valve. Thanks, HRL!