How much are vavle jobs?

Hey guys, my clicking at idling is really annoying me but i want to check alternatives to replacing my timing chain. How much do vavle adjustments cost, and are any special tools required? Thanks

your valves are non adjustable. just replace the chain its the best thing to do. its not that hard just take ur time or check out 240sx.org and check their faq they have the steps to do it