Supertech Subaru EZ30D Black Nitrided Exhaust Valve - +1mm Oversize - Single

This Supertech exhaust valve is black nitrided, a surface treatment that hardens the material and improves its resistance to wear and corrosion. It's also made to be 1mm oversize, which is helpful when you're rebuilding an engine and need to replace valves that have worn beyond standard dimensions or if you're looking to restore lost compression. This specific valve is designed for Subaru EZ30D engines.

The black nitriding process creates a durable surface that can withstand the high temperatures and stresses found in the exhaust port. Being 1mm oversize means it's a bit larger than the stock valve, allowing it to properly seal in a worn valve seat or a seat that has been re-machined to accommodate the larger size. This is a single exhaust valve, so you'll need to order the correct quantity for your engine rebuild.