Not sure what pin they are talking about, but I still say that it is not the engine; except for the cylinder head problem. Something wasn't installed correctly when the tech replaced the timing chain, guides or tensioner. The chain is actually held in place by gears and guides, along with a tensioner in the lower left of the engine. The tensioner has a pin for releasing the tensioner, I wonder if this is the pin they are talking about, and how did it screw up a cam. A cam gear yes, but the cam?
To replace the cylinder head is an extensive repair; however, if the tech does it right, it is a no problem repair. Screw one thing up, and pieces will fly.
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Black Sheep Hummer Squadron
(ME TOO)
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