GSC2021-8 Standard Exhaust Valve Set – Mitsubishi Evo X 4B11T
GSC Power-Division’s standard-size exhaust valves for the 4B11T engine feature a 29mm head diameter and are engineered for high-performance durability. Developed using advanced 3D modeling and simulation tools, these valves deliver superior flow and strength, with reduced face distortion for better sealing under extreme conditions. The result is consistent performance and longevity, even in high-boost, high-RPM applications.
Key Features:
- Swirl-polished heads enhance airflow across the valve surface
- Back-cut design lowers valve weight, supporting aggressive cam profiles and elevated boost without increasing seat pressure
- Micro-polished stems reduce oil retention and drag, improving motion and wear resistance
- Exhaust valves crafted from modified 23-8N stainless for high heat tolerance and extended life
- Valve tips are either hardened or fused with a stelite wafer, matched within 5 Rockwell C of the rocker or tappet for reduced wear
- Tip heights are optimized to minimize valve tipping and simplify valve lash setup
- Keeper grooves are precision-tuned to balance spring pressures and reduce the need for shims
- Compatible with OEM keepers/locks or GSC’s upgraded options—reuse of old locks is 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
