Agreed, and I've looked and even called Gm and Hummer about it and requested the 100K mile power-train warranty that was offered on 2007 and above.
They said they would make a record of my issue in the system.
I asked them if that meant that I would get the extended coverage should my truck's cylinder head fail past the 4 year 50K mile warranty. They said NO.
I asked them why make a note then? You're not covering it anyway?

Well, from here, I requested a supervisor who told me there was nothing he could do. What the ...!

Clearly a major problem exists that affects the Cylinder head of the truck's motor, and GM is aware of it, but since there has been no official bulletin released on it, they will do nothing.

???