Hydraulic lifter preload

BTW I'm not some 20 year old punk..
I've restored a few mopars in my life and have spent hours and hours reading books and manuals... and when I have a situation or problem I exercise all my resources on resolving the problem..
And like a stated before, I wasn't asking how to set preload.. I was trying to get info on possible lifter clacking after engine was brought to operating temp.. could be multiple reasons...
And I did a search before I created my post if that makes you feel better..