The Supertech black-nitrided exhaust valve set for Mazda/Ford Duratec 2.0L/2.3L engines is sold as eight valves intended for exhaust-side replacement. The description specifies a black-nitrided finish and full eight-piece packaging for undertaking a complete valve replacement on compatible Duratec engines where like-for-like exhaust valves are needed.
Supertech Mazda/Ford Duratec 2.0L/2.3L Black Nitrided Exhaust Valve - Set of 8