Ferrea Honda D16A6 30mm 5.5mm 115mm 25 Deg S-Flo +1mm Competition Plus Intake Valve - Set of 8

These Ferrea Competition Plus intake valves are made with a specific heat-treated alloy that’s known for its strength and resistance to high temperatures, which is crucial for keeping your D16A6 engine running smoothly under demanding conditions. Each valve measures 30mm in diameter with a 5.5mm stem and a total length of 115mm, and these are the +1mm oversized versions, meaning they’re slightly larger than stock to help improve airflow into the combustion chamber. The 25-degree S-Flo design on the valve face is a notable feature that helps reduce turbulence and improve gas flow efficiency, making them a solid choice for anyone rebuilding or modifying their D16A6 top end.

Ferrea uses a specialized multi-stage tempering process for these valves, which helps ensure they can handle the stress of repeated opening and closing cycles. This well-built construction contributes to their longevity and consistent performance, even when your engine is pushed hard. Because they are +1mm oversized, you'll want to make sure your valve seats are properly machined to accept the larger diameter for a perfect seal. This attention to detail in materials and manufacturing means you're getting a part that's built to last and perform.