The Supertech intake valve set for Honda B18A and B18B engines includes eight black-nitrided intake valves at +0.5mm oversize. Specified for those engine codes, this matched set is intended for replacement during head servicing or rebuilds where an oversize intake valve is required. The source description lists the engines, nitrided finish and the +0.5mm dimension.
Supertech Honda B18A/B18B Black Nitrided Intake Valve - +0.5mm Oversize - Set of 8