According to Car Complaints, the plaintiffs that filed this suit claim there is an improper clearance level in the valve guides in the 7.0L LS7 V8 engine. This, according to the plaintiffs, is evidenced by the alleged fact that GM developed a test for technicians to determine if there were valve guide problems in affected engines and abandoned the test procedure once it realized the test may result in a product recall. These plaintiffs also say GM has told them that excessive valvetrain noise in the 7.0L LS7 V8 is normal.
This suit, which was filed in U.S. District Court for the Central District of California, was previously dismissed, however seventeen of the plaintiffs then filed a motion to appeal that was sent to the Ninth Circuit Court of Appeals. The Ninth Circuit dismissed the suit this week, saying the plaintiffs “have failed to produce admissible evidence that their vehicles actually contained the alleged valve guide defects.” The only evidence of the engine defects provided to the court were “expert declarations,” that were determined to be not admissible in court.
The 7.0L LS7 V8 engine is the only engine offered in the C6 Corvette Z06, which was produced between the 2006 and 2013 model years, and is good for an impressive 505 horsepower and 470 pound-feet of torque. This engine was also used in the fifth-generation Chevy Camaro Z/28 and produced the same output in the limited-run sports coupe as it did in the Corvette Z06. The engine remains available to order through Chevrolet Performance as a crate engine today.