Supertech Subaru EJ20/EJ25 Sodium Filled Inconel Exhaust Valve - +1mm Oversize - Set of 8

Built from Inconel, a high-nickel alloy known for its exceptional strength and resistance to extreme heat, these Supertech exhaust valves are a solid choice for Subaru EJ20 and EJ25 engines, especially when you're pushing the limits. The +1mm oversize design means they're intended for engines that have been rebuilt or modified, allowing for larger ports and improved flow. Each valve is filled with sodium, a material that helps transfer heat away from the valve face and stem much more effectively than solid metal alone, keeping temperatures down under demanding conditions.

This set includes eight valves, enough for a complete engine rebuild on your EJ20 or EJ25. The Inconel material is crucial here; it can withstand the high temperatures and pressures found in performance or heavily used engines, resisting warping and fatigue where standard steel valves might fail. The sodium filling is a key feature for heat management, which is critical for maintaining valve integrity and performance over time, particularly in turbocharged applications common to these Subaru engines. This attention to material science and thermal management makes them a well-built component for serious engine work.

When rebuilding or modifying your Subaru EJ20 or EJ25, using components designed for high performance is key. These Supertech valves are a direct replacement for the stock size but are oversized by 1mm, so ensure your valve seats have been machined to accommodate them. This set is designed for builders who understand the importance of robust internal engine components for reliability and performance.