as I stated before,
" back off each rocker nut until it clicks
then set the rocker pre-load, hot /running and just very slowly turn the rocker nut, 1/2 turn in
,max ,past where it just stops clicking as you tighten the lash out of the hydraulic lifter,
just back off the rocker until it clicks at idle then slowly tighten until the click stops then add a 1/2 turn max, not all that high tech, but its worked flawlessly for decades
"