GSC Super Alloy +1mm Exhaust Valve Set – EJ20/EJ257 Turbo (GSC2017-8)
Optimized for High-Heat EJ Turbo Builds
Designed for Subaru EJ20 and EJ257 turbocharged engines, the GSC Power-Division Super Alloy Exhaust Valve Set features a +1mm oversized head for enhanced flow and durability. Built to withstand extreme exhaust gas temperatures—up to 2000°F—this set of 8 valves is ideal for high-horsepower applications.
Technical Specifications
- Part Number: GSC2017-8
- Oversized Head: +1mm (33mm)
- Stem Diameter: 6.0mm
- Overall Length: 104.25mm
- Head Diameter: 33.00mm
Engineered for Strength, Flow, and Longevity
Each valve is crafted with a chrome-polished stem for reduced friction and extended service life—especially when paired with GSC Manganese bronze valve guides. The under-head dish is optimized for weight savings, while swirl-polished and backcut heads improve airflow without compromising strength.
Key Features:
- Handles EGTs up to 2000°F
- Chrome-polished stems for smoother operation
- +1mm oversized head for increased flow
- Lightweight under-head dish design
- Swirl-polished and backcut for airflow gains
Perfect for Aggressive EJ Turbo Applications
Whether you're building for track, street, or high-boost reliability, this +1mm Super Alloy Exhaust Valve Set is the ideal upgrade for your EJ20 or EJ257 turbo engine.
Fitment:
- 2002–2005 Subaru WRX (EJ205 Turbo)
- 2004–2007 Subaru WRX STI (EJ257 Turbo)
- 2006–2014 Subaru WRX (EJ255 Turbo)
- 2008–2021 Subaru WRX STI (EJ257 Turbo)
- 1989–2001 Subaru Legacy GT/RS (EJ20 Turbo, JDM)
- 1992–2000 Subaru Impreza WRX (EJ20 Turbo, JDM)
- 1999–2001 Subaru Impreza WRX STI (EJ207 Turbo, JDM)
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