Engine Exhaust System problems of the 2008 Chevrolet Corvette

While driving on highway in 5th gear #5 exhaust valve dropped into the cylinder going through the piston and causing connecting rod to go through side of the block. Engine seized and caused the car to go into a 65 mph spin. Luckily this occurred late at night on a open 4 lane highway with little traffic. I nearly clipped an oncoming pickup truck but squeaked by him. The car had 32,000 miles on it but out of warranty because of the years. Total cost for this ls7 replacement cost me 18,000 out of pocket. I hardly even drive the car because I'm afraid of it happening again. I'm reluctant to sell it because of the valve issue happening to potential buyer and them coming after me for the failure. Gm needs to correct this problem before someone gets killed like I could have been that night.

Had to have the heads reworked because of bad guides at 13,500 miles. Car out of warranty gm does nothing and claims there isn't a problem. Stock 2008 z06 with 13,500 miles all (8) exhaust out of spec, (3) intake out of spec (5) intake only in spec by . 0001-. 0004 measurement done by katech/wcch can provide data if needed.

I had to replace the exhaust valves in my 2008 z06 in order to prevent catastrophic failure. Replaced 2-piece soda filled valves with 1 piece stainless steel valves. Upon inspection valve guides on #3 had excess slop. Sent heads out for machining and new guides. Stock engine had less than 20k miles. Manufacturer of engine has issued service bulletins acknowledging these errors exist.

The vehicle dropped a cylinder head valve and was fixed under original factory warranty in 2012. It was fixed by the dealer using factory parts. It was on the freeway and the motor lost almost all power. I had to get towed. It happened again in 2016 after 20,000 miles and religious oil changes. This car was maintained meticulously. They cylinders were found to be at fault of destroying an exhaust valve both times. Additionally, the number 8 cylinder was found to be consuming oil, which destroyed my catalytic converter. This is all with a vehicle which had under 40,000 miles (within powertrain mileage warranty, but expired duration warranty).

Engine dropped exhaust valve while the engine was turning 6800 rpm in third gear at 118 mph. The engine stopped right at the time I went to shift to 4th gear and the tach dropped to zero. I pulled the car into a run off area and got out of the car because I thought it might be on fire due to all of the smoke.