GSC Power-Division Valve Stem Seals – Subaru EJ20/EJ25

GSC Power-Division Viton Valve Stem Seals – Subaru EJ Engines (Part # GSC1022)

The GSC Power-Division GSC1022 Valve Stem Seal Set is designed to withstand the high temperatures and demands of performance-built Subaru EJ engines. Manufactured from premium Viton material, these seals offer superior oil control, heat resistance, and longevity compared to factory rubber stem seals.

Ideal for street and track applications, these valve stem seals are a direct-fit upgrade for EJ205, EJ207, and EJ257 cylinder heads using 6mm valve stems. A critical upgrade when rebuilding or upgrading valvetrain components to ensure long-term reliability and reduced oil consumption.

Key Features

• High-performance Viton valve stem seals for Subaru EJ engines
• Compatible with EJ205, EJ207, and EJ257 cylinder heads
• Designed for 6mm valve stem applications
• Superior oil control and thermal resistance
• Ideal for boosted and high-RPM engines

Technical Specifications

Vehicle Compatibility

• Subaru WRX – EJ205 / EJ207
• Subaru WRX STI – EJ257
• Compatible with both AVCS and Non-AVCS cylinder heads

Note: Ideal for high-performance engine builds where increased heat and pressure are present. Always install new valve stem seals during any head rebuild or valve upgrade.

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 information.