Supertech Toyota Supra 2JZ Black Nitrided Exhaust Valve - +1mm Oversize - Set of 8

This is a set of eight Supertech black nitrided exhaust valves, specifically designed for the Toyota Supra 2JZ engine. These valves are a +1mm oversize, meaning they are slightly larger than stock to potentially improve airflow and sealing in the combustion chamber. The black nitriding process hardens the surface of the valve, making it more resistant to wear and heat, which is crucial for exhaust valves that operate under high temperatures.

Choosing oversize valves like these is often part of a performance rebuild or upgrade for the 2JZ engine. The +1mm sizing requires matching valve seats to ensure a proper seal, and it's a common modification when porting and polishing cylinder heads to maximize airflow. The nitriding treatment not only adds durability but also helps reduce friction, contributing to smoother operation and potentially improved longevity of the valve train.

When rebuilding or modifying a 2JZ engine, using well-made components like these Supertech valves is important for achieving reliable performance. Make sure to confirm compatibility with your specific cylinder head and planned build before installation.