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The Supertech black nitrided exhaust valves are a set of eight made for the Mazda Miata 1.8L engine and provided as direct replacements. Nitriding is used to enhance surface hardness and wear resistance; these valves are sold as an application‑specific set for engine builders or rebuilds requiring matched exhaust valve components for the Miata 1.8L.
Supertech Mazda Miata 1.8L Black Nitrided Exhaust Valve - Set of 8
