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I always perfered to do adjust the valves with the engine running, idle lowered to 500rpm or so. Grab a 3/8" box wrench and the .010" feeler guage for the intake and a .020" for the exhaust.



Must have done hundreds this way "back in the day" when I worked at the dealership. No one liked upselling valve adjustments on a slanty and I always made good time =)