easiest way to adjust rockers-
bring #1 cyl to TDC on the compression stroke adjust exhaust valves on cyl 1,3,4,8 to zero lash (zero lash is the point when the pushrod no longer spins freely between your fingers) then 1 full turn. adjust intake valves on cyl 1,2,5,7 the same way. now rotate the engine until the damper lines up at zero again (#6 TDC compression stroke) adjust exhaust valves 2,5,6,7, and intake valves 3,4,6,8
it might sound complicated but its really simple and way faster than other methods.