My shop manuel has the clearances but thats all it really tells you. What else do I need to know? Does the valve I am setting need to just have the steam against the tappet? Or does that piston need to be TDC or BDC or anythign wierd like that? While I am at it, when I pulled the side covers off to get to the valves that whole area in there is all gunked up with old nasty goop. I know when I clean this all that junk is going to end up in the oil pan. Anything spiecal about cleaning this area?