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The Supertech black-nitrided exhaust valve for Honda H23 engines is a +1.0mm oversize single replacement supplied individually. The description identifies the nitrided finish and +1mm oversize size; this valve is intended to serve as a replacement exhaust valve for H23 applications when an oversized valve is required for valve servicing.
Supertech Honda H23 Black Nitrided Exhaust Valve - +1mm Oversize - Single
