Nissan Truck

I got a 1995 nissan truck. 115000 miles, 3.0 v-6, auto. I just changed the timing belt. It runs good and doesnt miss a beat. The gas milege kinda sucks, and I here a lifter or valve clicking alittle bit on the left side. Do I need to adjust the valves, or is it normal. And if I adjust them what is the gap?
May 3, 2007.

You can tighten the Rocker arm nuts and pivot locknuts at 12-16ft lbs. Don't work change the lifters.

BTW they do make noises at that age.

May 3, 2007.