Lost coolant and blew head gasket, need advice

[svenakela]

I made an mTDI swap in a VW Vanagon (T25) camper. The guy took the freeway and went pedal-to-metal for almost an hour until the smaller coolant line connected to the head on the short side broke, unfortunately it got torn by the drive shaft. This camper has the lowest geared transmission out there, so when the coolant line was punctured he had about 4000-4100 RPM. Engine got empty, got hot and the head gasket blew. With that RPM heat must have been buffered in the head before he went into panic mode.

I feel a bit sorry for him and of course it was my fault that the coolant line wasn't strapped, so I promised to help him fixing it (we'll get a better tranny at the same time). But what worries me is warping. The head could have been damaged, I haven't seen or heard about a warped TDI head so far. Of course, there are stories on the Internet but local guys have never seen one. The thing is that I don't know for how long he went with a dry engine, he doesn't seem to have a real clue either. Maybe the excessive heat acted like an annealing process by itself and the head is "self treatened", I don't know...
Is warpage something I should worry about?
Should I have the head pressurized to find leaks or cracks?

Just need some moral support here...

[R.O.R-2.0]

TDI head gasket is metal, so if it blew, the head prolly lifted..

[745 turbogreasel]

The manual from the donor car has a spec for max allowable warpage, and I think your chance depends if it was way too hot, causing the hose to blow, or mechanical damage killed  the hose at normal temp, and it took the driver 60 seconds to freak out from the smoke show and shut it down.

My last ALH head had eaten a glow plug, and snapped a timing belt, but still looked great when it came back from Frank06.
If the injector tip is melted, i'd be worried.

[svenakela]

The hose broke first. But the guy says that he suspects the gasket being blown already when the line broke, he had to refill with coolant the night before. On the other hand I was driving the car up and down the hills in my hoods and neither refilled nor had a temp gauge rally.

It came to my mind that I have another head, I think I take that one for now. Then I can measure this one afterwards when the chaos settles.

Thanks for the input guys.