i am hearing tapping on top under of vale cover sound like valve need adjusting
time to change oil, use thicker oil or yep, adjust valves. not a monstrous project but time consuming. Need torque wrench, valve cover gasket and shim kit to adjust. It's a pain as u have two nuts on each valve adjustment rocker bolt. tightening causes the lower one to drop sometimes so u may find yourself adjusting the valves 2-3 times each. I did it on my old Acura with 78K miles. ran smoother. i dropped in a pulley kit and cold intake as well but afterwards. the head was real clean as I change oil regularly. I had tapping even after changing the knock valve so I knew the valve job was needed.
