GSC Power-Division Intake Valve – Subaru EJ20/EJ25

GSC Power-Division Intake Valves – Subaru EJ20/EJ257 Turbo (36mm & 37mm)

The GSC Power-Division Intake Valves for Subaru EJ20 and EJ257 Turbo engines offer exceptional airflow, longevity, and high-RPM stability. Available in standard 36mm and +1mm oversize 37mm head diameters, these valves are engineered to handle the demands of high-boost and high-revving performance builds.

Each valve is CNC-machined with a swirl-polished, back-cut head for optimised flow and reduced mass, improving throttle response and cylinder filling. Manufactured from modified 21-4N stainless steel with hardened tips or stelite wafers, these valves are built to withstand extreme conditions while maintaining proper valvetrain geometry.

Key Features

• Available in 36mm (STD) and 37mm (+1mm oversize) head diameters
• Swirl-polished heads for increased flow efficiency
• Back-cut design reduces weight for improved RPM response
• Micro-polished stems reduce drag and wear
• Modified 21-4N stainless steel for high-temperature endurance
• Hardened or stelite-tipped ends for superior wear resistance
• Optimised valve tip length and keeper groove for proper geometry and spring balance
• Compatible with OEM or GSC upgraded keepers/locks

Technical Specifications

Vehicle Compatibility

• Subaru WRX – EJ20 / EJ205 / EJ207
• Subaru WRX STI – EJ257 / EJ257B
• Subaru Forester XT / Liberty GT – EJ Turbo Platforms

Note: Always inspect or replace valve locks during performance rebuilds. Reusing worn keepers can compromise valve train stability.

Warning: This product contains materials such as Nickel (Metallic), which are known to the State of California to cause cancer and reproductive harm. See California Proposition 65 for more details.