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C6 Z06s with the factory 7.0L LS7 suffer from a number of design flaws including valve guide wear, which can lead to catastrophic engine failure. To ensure reliability, follow these steps: 1. Inspect Valve Guides: Check for excessive wear or play in the valve guides. If they are worn, consider replacing them with upgraded guides. 2. Upgrade Valve Springs: The factory springs can fatigue over time, leading to valve float. Upgrading to high-performance springs can help prevent this. 3. Regular Oil Changes: Use high-quality synthetic oil and change it regularly to keep the engine lubricated and reduce wear...