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Properly tightening the rocker arms involves dropping each arm onto a 7/16-inch stud, then turning the motor to top dead center. Starting with the number one cylinder, turn the engine until you feel air blow out of the spark plug hole. Then tighten then lock with an wrench slowly while wiggling the pushrod. When the rod spins freely but has no play, tighten the wrench a 1/4 turn and tighten the locknut.