LS7 Crate Engines Valve Issues: Causes, Symptoms, and Solutions by Chad Golen March 26, 2026 0 Key Takeaways: Premature valve guide wear, often due to factory machining defects, is the leading cause of LS7 crate engine valve failures and can occur even in low-mileage engines. Early detection through systematic diagnostics is critical to preventing catastrophic engine damage. Upgrading to precision-machined cylinder heads with quality valve guides and disciplined maintenance practices significantly … Read More