Supertech Mitsubishi 4B11 EVO X Inconel Exhaust Valve - +1mm Oversize - Set of 8

If you're rebuilding the top end of your Mitsubishi 4B11 engine, especially for an EVO X, you'll want to pay close attention to your exhaust valves. These Supertech Inconel exhaust valves are designed to handle the extreme heat and stress that performance builds can put on them. They are a +1mm oversize set, meaning they are slightly larger than stock to help improve flow and sealing in the combustion chamber.

These valves are made from Inconel, a high-nickel alloy known for its exceptional strength and resistance to high temperatures and corrosion. This makes them a solid choice for engines that see hard use or are modified for increased power. The +1mm oversize design is a common upgrade when porting cylinder heads, as it can help maximize airflow through the ports. This set includes all 8 exhaust valves needed for a complete engine rebuild.