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 Valve Size Part # Material Head Diameter Stem Diameter Overall Length 36mm (Standard) GSC2012-8 Modified 21-4N Stainless 36.00 mm 6.0 mm 104.40 mm 37mm (+1mm Oversize) GSC2014-8 Modified 21-4N Stainless 37.00 mm 6.0 mm 104.00 mm 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.
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