I lifted my heads running 36lbs of boost at 4200 rpms pulling 26k. What do you expect? I knew it was a matter of time because of the way it was being ran. Put ARP studs in and haven't had an issue. The heads could of used 2 to 4 more bolts in them, but with the ARPs they hold together fine.
The 6.0 is a good engine it just got a bad rap because of the first few that came out and the issues they had. HPOP in the 05s and up is more what I would worry about.
Tow with mine daily and she hasn't failed me yet.
Ford did the repairs and installed the ARP studs. Truck never stopped running, just noticed it wasn't running the way it should and took it in. First mechanic said it was fine, but I knew it wasn't, so drove 600miles and had a different Ford mechanic look at it. 3 days later she had been tore down and put back together and I was on the road again.