It was a hell of the job for me. Clean the bores well. I could not get the cups to seal until the seventh time under the valve covers. Turned out I did not clean them enough for the loctite to seal. Therapy is helpful for PMS in general, and this job in particular...
Went good today had a bit of time to wrench on it not bad at all. Have one ? How did you guys get the valve cover bolt off next to pass side ac. Swivel set up? Might need to stop buy Sear or the Snap on truck.
This site is great
You need a 13 mm flex socket, a universal makes the assembly too big. If it's a truck, you can get at the bottom bolts through the wheel well. If it's an Excursion, you have to wait until the stores open.
You will want a host of items to make the job easier, every tool I used is posted in that link in my signature (complete with pictures and videos). The Mity-Vac with a vacuum gauge is indispensable on the 7.3L.