Supertech Mazda/Ford Duratec 2.0L/2.3L Black Nitrided Exhaust Valve - +1mm Oversize - Set of 8

Starting with a black nitrided surface treatment, these Supertech exhaust valves are built for durability in your Mazda or Ford Duratec 2.0L or 2.3L engine. This set includes eight valves, each measuring 1 millimeter oversize compared to stock. This +1mm sizing is often used when rebuilding an engine to ensure a fresh, tight seal in the valve guide and seat, especially if the original guides or seats have been reconditioned or replaced.

The black nitride coating isn't just for looks; it hardens the valve face and stem, making it more resistant to wear and heat. This is important for exhaust valves, which endure the hottest gases leaving the combustion chamber. The well-built nature of these valves means they can handle the demands of regular driving and more spirited use, providing a solid option for anyone refreshing their engine's top end.

When installing these oversize valves, it's crucial to ensure your valve guides and valve seats are properly machined to accept the +1mm dimension. This ensures a proper seal and prevents premature wear. Always refer to your vehicle's specific service manual for detailed installation procedures and specifications.