The Supertech black-nitrided exhaust valve for Honda B16A, B17A and B18C engines is supplied as a single replacement valve. The nitrided finish is specified in the description; this valve is intended for exhaust-side replacement across the listed Honda engines and is sold individually for use when a single exhaust valve must be replaced.
Supertech Honda B16A/B17A/B18C Black Nitrided Exhaust Valve - Single (Drop Ship Only)