Valve cover gaskets designed for LS-series engines from 1999–2017, manufactured from a performance-grade cork/rubber blend formulated to conform to uneven flange surfaces while maintaining strong crush resistance under high clamping loads. This material provides reliable sealing against gasoline, engine oil, water, and coolant in temperatures up to 350°F. Suitable for OE replacement as well as high-performance street, drag race, and oval-track applications.