[CorneliusRox]

What head work?
Are you just decking and checking valves? (That's not worth pulling the head IMO)
Are you just swapping valve springs? (You can do that by bringing whatever cylinder to TDC and then the valves wont drop)
Are you talking about bigger valves, fire rings, or chopping off the intake? (That's worth taking the head off)

I've heard people say that an old head gasket holds better than a new one, but I don't think that applies as much to the common rails since they have the MLS gaskets.