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

HAD MY VALVES CHECKED TO SEE IF THEY WERE OUT OF SPEC. I HAVE ATLEAST THREE EXHAUST VALVES THAT ARE OUT OF SPEC. AND I'M AFRAID TO EVEN DRIVE THE CAR FOR FEAR OF DROPPING A VALVE IN THE MOTOR, THUS POTENTIALLY CAUSING OIL OR ANTIFREEZE TO LEAK AND GET UNDER MY TIRES CAUSING ME TO WRECK MY $60,000 CAR, OR CAUSE HARM TO MYSELF OR TO OTHER DRIVERS. THIS IS A BIG SAFETY ISSUE FOR ME AND OTHER DRIVERS, NOT TO MENTION THE COST OF REPLACING THE MOTOR. *TR

CONCERNED ABOUT THE NUMBER OF DROPPED VALVES IN THE LS7 ENGINE USED IN THE CORVETTE Z06 THAT MAY RESULT IN A BLOWN ENGINE CAUSING A CRASH OR FIRE. I HAVE PRETTY MUCH PARKED MY 2008 Z06 DUE TO THIS CONCERN AS GM REFUSES TO ACKNOWLEDGE THAT THERE IS A PROBLEM BUT EMPIRICAL EVIDENCE ON PUBLIC USER FORUMS SHOWS THAT THERE IS A PROBLEM AND GM SHOULD ADDRESS AND FIX. I URGE THE NHTSA TO LOOK INTO THIS MATTER AS A MAJOR SAFETY CONCERN! *TR

I WOULD LIKE TO FILE A COMPLAINT DUE TO SAFETY CONCERNS OVER BAD HEADS AND VALVES PUT INTO A PERCENTAGE OF THESE CORVETTE Z06 CARS. GM HAS ADMITTED THERE IS AN ISSUE AND YET REFUSES TO DO ANYTHING ABOUT IT. THERE WAS A MACHINING ERROR WITH THESE HEADS AND THE ENGINES CAN DROP A VALVE WITHOUT WARNING OR SYMPTOMS AND WITHOUT PULLING YOUR MOTOR APART THERE IS NO WAY TO DETERMINE IF YOUR CAR IS AFFECTED OR NOT. THE FACT IS NOW THAT AN INCREASING PERCENTAGE OF THESE CARS ARE LOSING THEIR ENGINES AND REPLACEMENT COST IS OVER 17000.00. SHOULD THE ENGINE GO IT COULD LEAD TO A SERIOUS CRASH FROM THE ROD PUNCTURING THE BLOCK AND SPREADING OIL UNDER AND AROUND THE CAR WHICH NOT ONLY AFFECTS THE CAR IN QUESTION BUT ANY OTHERS FOLLOWING IT AT HIGHWAY SPEED. THERE HAVE BEEN SOME THAT HAVE GONE OFF THE ROAD BECAUSE OF THIS ISSUE AND IT IS TAKING ANY OF THE JOY OF OWNING OR DRIVING THIS CAR AT ALL. GM WILL NOT EVEN TELL ANYONE OUT OF WARRANTY WHAT TO DO TO ADDRESS THE PROBLEM AND WHEN SOME HEADS WERE REPLACED BY GM FOR CARS UNDER WARRANTY, SOME WERE FOUND TO HAVE BAD TOLERANCES BEFORE EVEN BEING INSTALLED. GM HAS NOW GONE ON TO THEIR NEW MODEL Z06 AND IS SIMPLY HOPING THIS ISSUE GOES AWAY WHILE THROWING ALL THEIR LOYAL CUSTOMERS UNDER THE BUS SO TO SPEAK. SOMETHING SHOULD BE DONE BEFORE THERE IS A DEATH CAUSE FROM THIS ISSUE, NOT TO MENTION A LOYAL CUSTOMER LOSING A 17000. ENGINE THROUGH NO FAULT OF THEIR OWN. I HAVE CONTACT CHEVROLET SEVERAL TIMES AND WAS MET WITH LITTLE RESPONSE OR ENTHUSIASM TO DO ANYTHING ABOUT THE PROBLEM AT ALL.

I WAS CONCERNED ABOUT EXCESSIVE VALVE TRAIN NOISE AND AFTER READING SEVERAL CORVETTE FORUM THREADS ABOUT IMPROPERLY MACHINED HEADS BY GM'S SUPPLIER LINAMAR, AND THAT NUMEROUS VEHICLES HAVE HAD VALVES DROP AND RUIN THE ENGINES, I TOOK MY CAR WITH 27000 MILES ON IT TO A CORVETTE SPECIALTY SHOP TO HAVE MY VALVE GUIDE CLEARANCE TESTED. I HAD (2) INTAKE VALVE GUIDES OUTSIDE OF SERVICE SPECIFICATIONS, (4) EXHAUST VALVE GUIDES OUTSIDE OF SERVICE SPECIFICATIONS, AND A COMBINATION OF (10) OTHER INTAKE AND EXHAUST VALVE GUIDES AT OR NEAR THE MAXIMUM OUTSIDE OF SERVICE SPECIFICATIONS. THE CAR IS BEING REPAIRED WITH PROPER RE-MACHINING OF THE HEADS TO MAKE THE VALVE GUIDES CONCENTRIC, NEW INTAKE AND EXHAUST VALVE GUIDES INSTALLED, AS WELL AS NEW SEALS, VALVES, SPRINGS, ETC. 88% OF THE CORVETTE FORUM MEMBERS WHO HAVE HAD THEIR CYLINDER HEADS TESTED FOR EXCESSIVE VALVE GUIDE WEAR, WERE OUT OF SERVICE SPECIFICATIONS. SOURCE: HTTP://WWW.CORVETTEFORUM.COM/FORUMS/C6-Z06-DISCUSSION/3386141-THE-OUT-OF-SPEC-GUIDE-WEAR-REGISTRY.HTML GM NEEDS TO ISSUE A RECALL ON THIS ISSUE, THERE HAVE BEEN NUMEROUS ENGINE FAILURES AS A RESULT OF A DROPPED VALVE INTO A CYLINDER WHICH CAN CAUSE ACCIDENTS AND FIRES. GM IS VERY AWARE OF THIS ISSUE, BUT REFUSES TO DO ANYTHING ABOUT THIS HUGE SAFETY RISK TO DRIVERS, PASSENGERS, AND NEARBY VEHICLES IF THE ENGINE FAILS GOING DOWN THE ROAD.

VEHICLE HAD 1/4 TANK OF FUEL IN THE TANK BEFORE FILLING ON FRI.AFTER FILLING TANK TO FULL NOTICED STRONG GAS SMELL FROM REAR OF VEHICLE,HAD TO ROLL WINDOWS DOWN TO DRIVE,ODOR WAS SO STRONG COULD NOT PARK CAR IN GARAGE DUE TO FIRE HAZARD,DID NOT SEE ANY EVIDENCE OF FUEL LEAKAGE ON GROUND,BROUGHT CAR TO DEALERSHIP ON MON.THEY STATED NOT COVERED UNDER FEDERAL EMISSIONS WARRANTY,ALTHOUGH IN CALIFORNIA IT WOULD HAVE BEEN,(SAME FUEL TANK USED IN ALL ZO6'S)ESCALATED IT TO GM WARRANTY CUSTOMER SERVICE,LEFT CAR AT DEALERSHIP AS ITS UNSAFE TO USE,WAITING ON WORD WEATHER THEY WILL HONOR EMISSIONS WARRANTY AND FIX POOR GM CRAFTSMANSHIP. BTW 42000MILES,NON TRACKED,NO ACCIDENTS,100% STOCK,SITS IN GARAGE 5 DAYS A WEEK. SHOULD BE CONSIDERED FOR A RECALL AS I AM NOT THE ONLY ONE W/THIS ISSUE. *TR

THE OTHER DAY I SMELLED GAS IN MY GARAGE. THE SMELL IS BAD UNTIL THE FUEL LEVEL DROPS BELOW 1/2 TANK. I TOOK MY CAR TO THE DEALER AND THEY SAID THEY CANNOT FIND A LEAK. I MENTIONED IF THIS IS COVERED UNDER THE 80K MILE EMISSION WARRANTY AND THEY SAID IT WAS NOT. THERE ARE MANY COMPLAINTS ABOUT THIS ISSUE AND THE SOLUTION IS TO DROP THE TANKS BECAUSE THE ISSUE MAY LIE IN THE FUEL PUMP AND LEAKING TANKS ON THE TOP. I BELIEVE THIS IS A SERIOUS SAFETY ISSUE REGARDING LEAKING FUEL TANKS AND THE CONSUMER SHOULD NOT PAY FOR A FAULTY ITEM BEING A SERIOUS SAFETY ISSUE. I KNOW THIS WAS AN ISSUE ON THE C5 CORVETTE AND GM REPLACED THOSE TANKS FREE OF CHARGE. THE C6 FUEL CELL IS THE SAME AS THE C5 AND IT APPEARS LIKE ITS ALSO FAULTY AS WELL. PLEASE REVIEW ALL C6 CORVETTES (2005-2013) COMPLAINTS ON THIS SITE. THIS SHOULD BE A RECALL OR A FIX BY GM TO COVER THE COSTS. *TR