Let me guess...you work for Chevy, right? How else can you defend the perhaps hundreds of dropped valves, and perhaps thousands of other LS7s with defective guides, that are getting ready to fail?
You sound like a corporate shill, my friend. Here's hoping that, if you indeed own an LS7, that you never have a catastrophic failure due to GM's lack of quality control in their LS7 cylinder head sourcing. Otherwise, you just may find that you change that silly little tune you are singing.
First of all, sorry to hear about your engine problems and expenses. That definitely sucks.
There seems to be 3 issues here: the warranty (or specifically, your interpretation there of), product quality control, and customer service response.
1. If your issue is with the warranty, I have to agree with Mike. No automotive company (that I'm aware of) will warranty a car forever with no conditions attached. It seems reasonable to me that a company's liability ends after the [contracted and agreed upon] warranty period is up.
When you bought your car, I assume you were fully aware of the terms and conditions of the warranty, right? What did you think would happen after the warranty expired? Furthermore, why didn't you buy an extended GMPP warranty (although I guess that doesn't really matter now anyway)?
2. If your issue is with GM quality control - that it should be improved - then I wholeheartedly agree with you. But what can you do? You bought a car from a company that's known for being cheap and cutting corners. All you can do is accept this fact and move on to another brand next time. Maybe you'll have better luck. Then again...who knows?
3. Lastly, if your issue is with customer service, I do believe that GM is sincerely trying to work with current C6Z owners. What would be an acceptable response in your mind? Do they owe you a new engine?
It's my experience that certain customers really do believe that "the customer is always right", even when they clearly are not. Btw, you've been "abandoned"? Little dramatic, don't you think?
C6Z owners are the whiniest group of Corvette owners I've ever seen. First, they complained about the introduction of the ZR1, essentially trumping the C6 Z06. "How could GM do this to us!", they said. "I thought I was buying the BEST Corvette EVER!" Apparently GM didn't care about you then either.
Then it was the C6 Grand Sport wide body debacle. Oh the humanity.
Now we've apparently reached the point where, "standing behind your product", means providing an unlimited warranty for the life of the car. Yeah, OK.