02 1500 4.7 156000+ mile maint

[nickledimed]

Greetings,
I have an 02 1500 4.7 with 156000 miles on it.
Loving the truck, have had it 5+ years now.
I want to keep it, so, I am wondering if there are any special maintenance that I need to do.
I know in the past that on some vehicles it was recommended that the valves be adjusted at 150000 miles.
I checked the manual and it only goes up to 120000 miles.
I am hearing a tick at idle so that is why I am asking.
That tick could have been there all along, you know how us humans can be.
I have checked the maint schedules in the manual but they only go up to 120000 miles.
Thanks for the advice, looking forward to the responses.