GSC2021-01 Standard Exhaust Valve – Mitsubishi Evo X 4B11T
Designed for the Mitsubishi Evo X 4B11T platform, the GSC2021-01 standard-size exhaust valve features a 29mm head diameter, 5.5mm stem, and 105.85mm overall length. Engineered using advanced 3D modeling and flow simulation, this valve delivers improved airflow and durability under extreme conditions.
GSC’s proprietary design minimizes face distortion, enhancing seal integrity and consistent performance over time. These valves are built to meet the demands of high-boost, high-RPM applications and are compatible with OEM or upgraded keepers/locks.
Key Features:
- Swirl-polished valve heads for smoother airflow
- Back-cut design reduces weight for better RPM response and aggressive cam profiles
- Micro-polished stems reduce oil retention and drag for smoother movement
- Exhaust valves made from modified 23-8N stainless for heat resistance and longevity
- Hardened or stelite-tipped valve ends for extended wear life
- Optimized tip height for proper valvetrain geometry and easier lash setup
- Keeper grooves tuned to balance spring pressures and reduce shim use
- Works with OEM or aftermarket keepers—reusing old locks not recommended for performance builds
Fitment:
- 2008–2015 Mitsubishi Lancer Evolution X GSR
- 2008–2015 Mitsubishi Lancer Evolution X MR
- 2008–2015 Mitsubishi Lancer Evolution X Final Edition
- 2008–2015 Mitsubishi Lancer Evolution X SE (Special Edition)
- 2008–2015 Mitsubishi Lancer Evolution X FQ Series (UK models)
- 2008–2015 Mitsubishi Galant Fortis Ralliart (JDM only)
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
