Isn't there one headbolt on these engines the requires you to remove the rocker assembly? It's the #1 headbolt, the first bolt in the torque sequence, and it's located right under the center oiler.
I thought I remembered this as the stumbling point in the 'easy to reach' scenario. Maybe a crows foot wrench would do it, but I don't think that will work either.
So a head retorque requires you to remove the rocker assembly, yes or no?
Stuart