Supertech Toyota 4AGE 20V Black Nitrided Exhaust Valve - +1mm Oversize - Set of 8

The black nitriding treatment on these Supertech exhaust valves is a key detail. This process hardens the surface, making it more resistant to wear and corrosion, which is crucial for exhaust valves that deal with high temperatures and combustion byproducts. This set includes eight valves, each measuring 1mm oversize, designed specifically for the Toyota 4AGE 20V engine.

When you're rebuilding the top end of a 4AGE 20V, using valves that can handle the heat and stress is important for long-term reliability. The +1mm oversize dimension allows for a larger valve head diameter, which can improve airflow into the cylinder, potentially leading to better performance. These valves are well-built to meet the demands of an engine that's often pushed hard, whether in a daily driver or a performance build.

If you're working on a 4AGE 20V engine, this set of eight black nitrided, +1mm oversize exhaust valves from Supertech is a solid option to consider for your rebuild. They are designed to fit right and offer improved durability over stock components.