Manifold/header/muffler/tail Pipe problems of the 2007 Chevrolet Silverado 3500

Exhaust manifold bolts on the 6. 0l break off at the head causing exhaust gas to leak into passenger compartment and potential for a fire. We have 10 trucks around this year and most or all have had all exhaust studs replaced. My local dealer is aware of this the service manager told me it happens to all 6. 0l engines.

Our 2007 Chevrolet 3500 4 x 4 with a 6. 0 gas engine has failure in the exhaust manifold bolts and is causing noise and emission issues in and outside the cabin and is affecting horse power. Our truck has now 13,000 miles on it! thirteen thousand. It is well cared for and little used, there is no excuse that we face a thousand dollar or more bill to repair a unit that is a long way from being a used unit. We know of many now, that have this issue, our friend said he would not pay the dealer to do it for his truck, there is no service bulletin and no recall, but it was affecting everything, and you could not gain access to the broken bolts unless you tore out the top end of the motor, so he removed the motor and rebuilt these parts himself, it cost him he said $700. 00 to do it himself. He is still mad about it. We are writing you in hopes that you may investigate and help, there are emission violations in many states due to this, and there can be a fire, it can affect the sensors and will trigger codes causing engine light to remain on. This problem affects nearly 7 or 8 years of gm trucks, 4. 8, 5. 7 and the 6. 0 size engines. At first it was not too bad, but it has gotten worse in the past few thousand miles. The mileage of seven thousand is my approximation of when I first heard it, I thought it was exhaust, but I thought a protective plate over the muffler or something, no way did I think the bolts of the manifold were breaking. Please help us out on this.