Ferrea Honda B18A1/B1/B20A 31.5mm 6.57mm 105.5mm 20Deg S-Flo Dish +.5mm Comp Plus Int Valve-Set of 8

These Ferrea Comp Plus intake valves are built with a 31.5mm head diameter, which is a +.5mm oversize compared to stock. This larger diameter helps improve airflow into the combustion chamber, especially when paired with other engine modifications. They are designed for Honda B18A1, B1, and B20A engines, fitting directly into the factory valve seats if they are properly machined for the +.5mm size.

The valves feature Ferrea's S-Flo dish design and a 20-degree seat angle, which are optimized for better air velocity and a more efficient burn. The overall length is 105.5mm and the stem diameter is 6.57mm, ensuring proper fitment within the valve guides and compatibility with standard valve springs and retainers. Ferrea uses high-grade materials to ensure these valves can handle the heat and stress of performance engine operation.

When rebuilding or modifying your Honda B-series engine, using well-built valves like these can make a notable difference in performance. Ensure your valve guides are in good condition and properly sized for the +.5mm stems before installation.