Everyone has their way of doing it. What it means is the point where all the slack is gone from the push rod valve train but the lifter piston has not collapsed any.
How you "feel" that is kind of the trick.
What I have a few other do is kind of rotate or shake the rod side to side as you tighten the rocker. As soon as you feel any movement gone that is zero lash.
The books will usually say to rotate the rod until you feel it get tight but seem by the time you feel that your a little past zero.
shaking it side to side and feeling the click seems to get closer for me.
[This message has been edited by Dodgerunner (edited 03-13-2007).]
