You guys are awesome, will be sending more samples as the engine gets more mileage. The exhaust valves are titanium and the guides failed.  I want you to help me publish this data for all the Corvette owners so they can get this done. I had 5,000 miles after you saw how high titanium is and multiple experts told me it was all normal!!!!!!!!! This is the proof without tearing the motor down. And if it shows up again we will know the guides failed again.