Supertech Subaru EJ20/EJ25 Black Nitrided Exhaust Valve - +0.5mm Oversize - Single

This is a single Supertech exhaust valve, specifically made for Subaru EJ20 and EJ25 engines. It's built to a +0.5mm oversize dimension, which is useful when you're rebuilding an engine and need to account for wear or machine work on the valve seat. The black nitriding treatment on this valve helps to improve its surface hardness and wear resistance, giving it a longer life in the demanding environment of an exhaust port.

When you're working on the top end of an EJ engine, getting the right valve is crucial for proper sealing and performance. This valve is designed to fit right into the stock valve guides, but remember it's an oversize part, so it's intended for engines that have been machined to accept it. The nitriding process not only makes the surface tougher but also gives it a distinct black finish.