4 Barrel

It takes a light touch on feeling where that Zero Lash point is as you are spinning those pushrods by hand, and turning down the the adjustable rockers.

The lifters will not be pumped Up after the engine has sat for a period of time.

The thing is the upper disc in the lifter is topped out, this is the point where you want to start with Zero Lash, it is a light touch because the lifter is not filled with oil yet. So back off the adjustable rocker, then slowly work your way down to zero lash.

Then at Zero Lash with the lifter disc at the top, then you adjust the rocker down 3/4 of a turn to get that upper disc down into the lifter a bit so it can float and "actually" be adjusted by the engine oil pressure as the engine comes to life.