Quote Originally Posted by Init2winit
Very simple. When one of the valves open to its peak, adjust the other valve on that cylinder. Zero lash, plus 1/2 turn. Repeat till you're done. BUT, be very careful that your lifters haven't blead down, or you may trick yourself, and mis-adjust one and keep the valve open. I usually don't even bother spinning the pushrods, I just tighten down the nut till there isn't any play in the rocker arm, and then add 1/2 turn. Its pretty self explanatory.
Exactly what he said. The way I've always done it is when one valve is completely open, go to the other valve on that cylinder, turn till theres no play in the rocker arm, then between a 1/4 and 1/2 turn afterwards. Very simple to do.