NHTSA Complaint #10679435 — 2008 CHEVROLET CORVETTE Z06

CHECKED ENGINE HEADS AND VALVES DUE TO THE ONGOING ENGINE FAILURES OF THE LS7 ENGINE. NUMBER 7 INLET VALVE WAS FOUND TO BE STRESSED TO THE POINT OF IMMINENT FAILURE DUE TO THE FACTORY MACHINING BEING OUT OF ALIGNMENT WITH THE VALVE STEM AND THE VALVE SEAT. 2 OTHER INLET VALVES WERE FOUND NOT CONCENTRIC AND WERE REPLACED ALSO. THE EXHAUST VALVES WERE FOUND TO BE OUT OF FACTORY SPECIFICATIONS WITH THE VALVE GUIDES SO ALL 16 VALVE GUIDES AND 8 EXHAUST VALVES WERE REPLACED ALSO AND THE HEADS MACHINED TO FACTORY SPECIFICATIONS. WHEN THESE ENGINES FAIL, THE ENGINE STOPS AND YOU HAVE NO POWER STEERING OR VACUUM POWER TO THE BRAKES SO YOU STRUGGLE TO STOP THE CAR AND STEER IT TO A SAFE PLACE. THE ENGINE BLOCK, BEING ALUMINUM, NORMALLY VENTILATES WITH A CONROD OUT THE SIDE AND OIL AND COOLANT IS DEPOSITED ON THE ROAD SURFACE. NOT A GOOD SITUATION IN MY OPINION AS WE DRIVE OUR CAR ON MAJOR HIGHWAYS FAIRLY REGULARLY. GENERAL MOTORS IS AWARE OF THE SITUATION AND SO FAR HAS DONE NOTHING TO SHOW ANY CONCERN FOR THE MOTORIST WHO OWNS THE CAR OR THE INNOCENT MOTORIST MINDING HIS/HER OWN BUSINESS ON THE HIGHWAY. *TR