Engine Exhaust System problems of the 2002 Chevrolet Silverado 2500

Exhaust manifold bolts on 2002 Chevrolet 2500 hd 6. 0 l v8 are broken at the back bolt on the drivers side. The passanger side exhaust manifold is cracked between the 3rd and 4th bolt from the front. I replaced the bolts on the driver side, except for the back one that is sheared off flush with the cylinder head. The only way to get this particular bolt out is to remove the cylinder head from the engine so that a machine shop can drill out the offending bolt. The replacement bolts that I purchased from the gm dealer were a much sturdier bolt that had a much larger head on the bolt. To me this indicates knowledge that there is a problem and that gm is aware of it. This will most certainly lead to an exhaust leak that will cause the check engine light to come on. A vehicle with the check engine light on cannot pass a field emissions test and will result in a revocation of the vehicles registration until the problem is corrected. This is now a serious problem that is very expensive to repair. Gm should be held accountable for the possible epa violations that this well documented issue is now causing. This vehicle only has 70,000 miles on it, very low for a 2002.

For the second time --last time about 3 years ago --the dealer tells me that the rear exhust manifold bolts have sheared off . I hear from other mechanics and the internet that this happens all the time on silverados . It is very expensive to repair .

Broken exhaust manifold bolts.

Broken exhaust bolts on my 2002 chevy 2500 hd truck, I went to the local garage and they told me they had worked on 6 other trucks with the same problem. There was a gm sales men there and said they have been having alot of trouble with the bolts breaking on the 6. 0 motors.