Corvette C6 Z06 Owners File Class Action Suit Against Chevrolet.

The LS7 is a very strong motor in itself, but has certainly shown where its weak point is. That is in the exhaust valves and valve guides that were used. Many failures have been a result of a dropped valve, and Chevrolet has been beating around the bush too long as to why. Owners have been lied to about what cars are effected, and lied to in a way to test if your car is effected. Most have paid anywhere from $1K - 5K(USD) to have the heads “repaired”, and it isn’t a guarantee fix. Many others have had to replace the LS7 after a failure, which can cost nearly $15K(USD) to replace.

Not all LS7 cars have had these issues. But some have failed at the track, and some have failed cruising at less than 2000rpms and never seen a track.

Another article that cannot be linked states the following:

When faced with a number of complaints about the alleged defects, GM insisted that “valve train noise” was an inherent feature of the engine and that they weren’t defective, according to the complaint.

The company tried to minimize the extent of any problems by falsely asserting that the problems came from a single supplier and were limited to a short period of time from July 2008 to March 2009, according to the complaint.

And as a result of the customer complaints, GM developed and implemented an investigation technique known as the “wiggle method,” as a way to determine whether the valve guides were out of specification, the drivers said.

Using this test, a high proportion of owners or lessees of the affected cars had out of specification valve guides, according to the complaint.

“When GM determined that its adopted test would lead to more repair and investigations than it wished to perform, the test was summarily rejected,” the drivers said. “In dealing with multiple complaints concerning the subject engine in the class vehicles, GM acted, at all times, to deflect criticisms, defer investigations and repairs, and minimized the extent of the problems.”