Supertech Ford Duratec 5.5mm Viton Integral Valve Stem Seal w/Spring Seat - Single

If you're rebuilding the top end of your Ford Duratec engine, replacing the valve stem seals is a crucial step. These Supertech seals are designed to keep oil from getting past the valve guides and into the combustion chamber, which helps prevent smoking and oil consumption.

This particular seal is made from Viton, a material known for its excellent resistance to heat and oil, making it a solid choice for engine components. It also features an integral spring seat, which is a nice touch that can simplify installation. At 5.5mm, it's sized for specific applications, so make sure it matches your engine's requirements.