I am sure most of you have heard that a stock Z06 engine with less that 1000 miles has to be replaced. Thankfully GM is stepping up and replacing the engine. What is important to learn from this is don't change your engine tune. If you do the chances are high that you will be replacing your engine. Nobody knows how close to the edge the LT4 is running at this time but it those with a Z06 coming should take note.