They want you to make sure the valve is all the way closed to adjust or shim them. Just take the valve cover off (you have to anyway) and turn the engine by hand untill you see them closed or all the way up.
68 fastback, 390 4V premium fuel
80 5.0 hatch, just finished
91 5.0 coupe, daily driver
84 RamCharger 4x4 extreme mudsliger and winter junker
68 fastback, 390 4V premium fuel
80 5.0 hatch, just finished
91 5.0 coupe, daily driver
84 RamCharger 4x4 extreme mudsliger and winter junker