2007 CHEVROLET CORVETTE Z06 Complaints

AFTER MONTHS OF READING ABOUT THE EXHAUST VALVE ISSUE WITH CORVETTE Z06S I TOOK MY CAR AND HAD THE HEADS CHECKED. THE SHOP FOUND THE VALVE GUIDE CLEARANCE TO BE OUTSIDE THE SPECIFIED ACCEPTABLE RANGE. THE DEFECT PUTS UNDUE STRESS ON THE SODIUM FILLED VALVES AND IF THE VALVE FAILS IT CAN CAUSE CATASTROPHIC ENGINE DAMAGE AND POTENTIALLY DEADLY SITUATION IF THIS OCCURS AT SPEED ON THE ROADWAY AS THE DRIVER WILL LOSE ABILITY TO CONTROL THE VEHICLE POTENTIALLY CAUSING A DEADLY ACCIDENT. I PAID SEVERAL THOUSAND DOLLARS OUT OF POCKET TO FIX THIS ISSUE DESPITE GM ACKNOWLEDGING THERE IS AN ISSUE WITH THESE VEHICLES.

THIS MODEL CORVETTE CAN SUDDENLY DROP AN ENGINE VALVE (EXHAUST OR INTAKE) AND UNEXPECTEDLY DEVELOP A HOLE IN THE BLOCK ACCOMPANIED WITH OIL SPILLED ON THE ROADWAY, SMOKE BILLOWING WITH RISK FOR VEHICLES BEHIND AND IN FRONT, AND THE RISK FOR TOTAL LOSS OF POWER STEERING, BRAKING AND CONTROL OF THE VEHICLE. THE OUTCOME IF THIS HAPPENED ON A FREEWAY WITH CARS TRAVELING AT A HIGH RATE OF SPEED IS POTENTIALLY FATAL. ALL OF THIS IS DUE TO MACHINING ERRORS AND SUPPLIER DEFECTS FOR THE ASSOCIATED PARTS (VALVES, GUIDES, ETC.) ON ALL 2006-2013 CORVETTE C6 Z06'S MADE BY GM. *TR

WIGGLE TEST ON ALL VALVES SHOWED ALL EXHAUST VALVES WITH EXCESSIVE GUID WHERE....SAFETY ISSUE....!!! THIS CAN AND HAS LED TO CATASTROPHIC ENGINE FAILURE AT FREEWAY SPEEDS....... *TR

I TOOK MY CAR TO AMERICAN HERITAGE PERFORMANCE IN CALIFORNIA AND HAD THE HEADS CHECKED AND THEY WERE ALL OUT OF SPECK, AT 16000 MILES, AND THIS CAR WAS ONLY STREET DRIVEN, AND HAD TO HAVE ALL THIS WORK DONE ON A LOW MILEAGE CAR WAS VERY UPSETTING, AND IN THE END FINDING OUT THAT MANY CARS HAVE THIS PROBLEM. HAVING TO GET ALL THIS WORK DONE ON A VIRTUALLY NEW CAR IS RIDICULOUS.. *TR

WHEN I PURCHASED THE 2007 CORVETTE Z06, I WAS INSTRUCTED TO HAVE THE HEADS CHECKED FOR EXCESSIVE VALVE GUIDE WEAR. I HAD THE HEADS PULLED AND THE VALVES EXAMINED BY A LOCAL EXPERT. HE INDICATED THAT THE VALVE GUIDES WERE OUT OF SPECIFICATION AND NEEDED REPLACEMENT. I REPLACED THESE AT MY OWN EXPENSE OF OVER $2000.00. HAD THE ENGINE BLOWN UP AS A RESULT OF THIS DEFECTIVE CONDITION, THE BREAKS AND POWER STEERING WOULD FAIL CAUSING AN ACCIDENT. I WOULD LIKE GM TO ISSUE A RECALL ON THIS MODEL CORVETTE. *TR

AT ONLY 21,179 MILES, MY DEALER INSPECTED BOTH CYLINDER HEAD BANKS AND FOUND VALVE GUIDE CLEARANCE TO BE WELL OUT OF MAXIMUM ALLOWED SPECIFICATION. THIS DEFECT PUTS UNDUE STRESS ON THE HOLLOW, SODIUM-FILLED EXHAUST VALVES. IF AN EXHAUST VALVE BREAKS, THE EXHAUST VALVE WILL DROP INTO THE COMBUSTION CHAMBER, AND CAUSE A COMPLETE, CATASTROPHIC FAILURE OF THE ENGINE. THIS CAUSES HAZARDOUS CONDITIONS FOR THE DRIVER, PASSENGER, AND SURROUNDING TRAFFIC: THE DRIVE WHEELS MAY BECOME LOCKED AS THE ENGINE SEIZES AND THE ENGINE BLOCK MAY BECOME WINDOWED BY A ROD, CAUSING A LARGE SPILL OF OIL AND COOLANT IMMEDIATELY UNDER THE VEHICLE ON THE ROADWAY. THESE CONDITIONS COULD LEAD TO A SEVERE ACCIDENT FROM A SUDDEN SPIN AND/OR A FIRE. I HAVE LITTLE CONFIDENCE THAT THE CYLINDER HEADS REPLACED ON MY CAR ARE FREE FROM THE VALVE GUIDE CLEARANCE DEFECT. AS MORE OWNERS HAVE BECOME AWARE OF THE PROBLEM, REPLACEMENT CYLINDER HEADS HAVE BEEN MEASURED BEFORE INSTALLATION ON THE ENGINE AND HAVE BEEN FOUND TO HAVE DEFECTS IN VALVE GUIDE CLEARANCE AND VALVE GUIDE TO SEAT CONCENTRICITY, SUCH AS WHAT COULD LEAD TO A DROPPED EXHAUST VALVE AND AN ACCIDENT. THE VEHICLES SHOULD BE RECALLED AND FIXED BEFORE ANY MORE SERIOUS ACCIDENTS OCCUR. ALTHOUGH MY VEHICLE DID NOT FAIL DESPITE HAVING THE DEFECT, I HAVE SEEN A VIDEO OF A SPIN CAUSED BY THE FAILURE, I HAVE SEEN PICTURES OF A VEHICLE AFTER A FIRE CAUSED BY THE FAILURE, AND I HAVE SEEN REPORTS OF APPROXIMATELY 35 FAILURES; ALL FROM CORVETTEFORUM.COM. THEREFORE I AM CONCERNED ABOUT MY SAFETY WHEN DRIVING THE VEHICLE AND I BELIEVE THE NHTSA SHOULD INVESTIGATE THE MATTER. *TR

ABNORMAL VALVE GUIDE WEAR IN CYLINDER HEADS CONSIDERING AGE AND MILEAGE OF VEHICLE. POTENTIAL CATASTROPHIC ENGINE FAILURE FROM DROPPED VALVE IF NOT ADDRESSED. CHEVROLET SHOULD FIX WHETHER VEHICLE STILL IN WARRANTY OR NOT AS IS BELIEVED TO BE POOR QUALITY CONTROL RESULTING IN MACHINING ERRORS. *TR

EXHAUST VALVE BROKE DUE TO VALVE GUIDES BEING OUT OF SPEC. ENGINE SEIZED. IMMEDIATE LOSS OF POWER STEERING AND BRAKES DUE TO SEIZED ENGINE.

MY CYLINDER HEAD INTAKE AND EXHAUST VALVES WERE SEVERELY OUT OF GM'S .0037" MAXIMUM WIGGLE TOLERANCE. THE VALVES WERE TESTED BY YUMA AUTO AND TRANS AS WELL AS AMERICAN HERITAGE PERFORMANCE (HARBOR CITY, CA). NOT ADDRESSING THE ISSUE MAY HAVE CAUSED A DROPPED CYLINDER VALVE AND BLOWN ENGINE.

LOW BEAM HEADLIGHTS GO OUT WHILE DRIVING? HAPPENS DAILY THEN LIGHTS COME BACK ON AFTER HOURS? STRANDED 5 HRS ON INTERSTATE AT REST STOP! *TR