What happened to the tutorial on adjusting the valves??

Quoting the manual, "adjust the valve clearance for Clyinder 1 with the piston in the firing postion. The valves on the Clyinder 6 will then "rock"."

What is the firing position and what is "rock"??

Valve cover off and ready to tag the bolt on the pulley. Anybody adjusting the valves on a 40 series, give me a shout---rt