Supertech Performance SEVI-1016-8 Inconel Exhaust Valves for Subaru EJ25

Supertech SEVI-1016-8 sodium-filled Inconel exhaust valves are engineered to significantly reduce valve head temperatures in modern turbocharged and high-performance engines. The cooler operating temperatures improve material strength and durability while providing tuners greater flexibility in spark timing advance.

Key Features:

• Head diameter: 32.00mm (standard size)
• Stem diameter: 5.96mm
• Overall length: 106.2mm
• Material: Inconel-Nimonic alloy
• Single groove design
• Tip diameter: 6.3mm
• Average weight reduction of 10% over stock valves

These nickel-based superalloy valves are specifically designed for extreme heat and sustained duty cycles, offering high-temperature strength, excellent oxidation resistance, and precise seat geometry for reliable sealing and durability. Ideal for engines that see elevated exhaust gas temperatures during extended boost or competition use.

Application: Subaru EJ25 Non-Turbo DOHC engines