Lifters don't tick tick tick.
Lifters rattle on cold startup, or a semi-failed lifter will clack.
If you have S&S lifters adjusted properly and still have tick tick tick, it's somewhere else.
I had my valve springs replaced with av&v .600's chasing the ticking when hot, made a huge difference. I took out S&S standards because they had over 15K miles on them, put in 850-1's. Low rpm when hot ticking is significantly reduced, 2700-3000 ticking or sewing machine noise is still prevalent (I think that is the rocker shafts).
I'm no expert, not a mechanic. My Harleys go tick tick tick. Andrews 57 cam. Earplugs and loud music.