Originally Posted by mandrex
Download the service manual (sticky thread here) and you will see how to get to the valves and what the spec is. You can get shims at your local auto parts store (for next to nothing) and have at it. Just open her up and use the shims to check - nothing that requires a PhD. There are probably a million write ups on the web about how to do a "valve job" that would do a better job of explaining the process at length than I could here.
Best to have a torque wrench as well if you do need to adjust.
OHhhh. Alright Thanks For The Lead!