I need to know (please don't think I'm dumb), but I have never adjusted the valves on my '99 CTD. I need to know which valves are intake and exhaust, standing at the front of the truck looking at the engine. I know how to adjust them, but I have never had the valve cover off, and would like to know before I take it off, so I don't have to figure it out once I take it off. 
