This is how I always do it. For me it's just simpler. I copied this info. a while back as my memory sucks these days lol.
Valve adjusting
This procedure is generally called the EO/IC method, which stands for exhaust opening/intake closing. Working with the first cylinder turn the engine until the exhaust valve starts to open. That indicates that the intake valve is resting fully on the cam base circle and can be adjusted. Then turn the engine over until the intake valve is just about to close. That means the exhaust valve is ready to be adjusted. Simply repeat this process with all remaining cylinders.
The process is slightly different with hydraulic lifters. There is no gap to set; rather, the lifter needs a “preload” to ensure that the plunger is in the center of its travel. Basically, the pushrod is rotated with one hand and the rocker arm is tightened until the pushrod is snug in place or at zero lash. Then the adjuster is turned or tightened until there is enough preload. The amount the adjusting nut is turned depends on the type of adjustment mechanism as well as the lifter. Most applications will use a 7/16-20 rocker-arm stud. A full turn of the adjustment nut moves the rocker .050-inch, so a quarter turn will provide .0125-inch preload in the lifter. The adjustment on the pushrod end of the rocker arm can be calculated in a similar manner.
Jesel uses a 3/8-24 screw adjuster, which equates to .041-inch movement with each full turn.
