I'm interested in why you believe the valve adjustment will cure your issue? Most of the motoring public has no idea what a valve adjustment is, and when specific questions like this are posed at our shop, most of the time somebody told the customer somewhere else to perform said service. Is there a check engine lamp on by any chance? How many miles on the vehicle? Anyhow, if I looked it up correctly in my information system, the labor time appears to be 5.2 hours. This particular setup involves replacing shims underneath the cam follower cups, it's a pretty involved process, and not something that is done as a maintenance item very often, which is why I am curious as to how you came to the conclusion of valve adjustment. Hope this information helps, let me know if you need more assistance.