FERREA BRONZE VALVE GUIDES HONDA B-SERIES H-SERIESFERREA Valve Guides are stronger than stock and help pull heat off of the valve, increasing its longevity. They are precision machined from high quality Manganese Bronze material. They are ideal for both intake and exhaust applications and are compatible with both stainless steel and titanium valves. Suitable for all B series and H series engines. B16A, B16B, B18C, H22A etc.