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SKU: 2021-8
GSC Power-Division 2008-2015 Mitsubishi Lancer Evolution X 4B11T 23-8N Chrome Polished Exhaust Valve - 29mm Head (STD) - SET 8
Replace stock exhaust valves in your 2008-2015 Mitsubishi Lancer Evolution X 4B11T engine with this GSC Power-Division set of 8. Featuring 29mm standard head diameter and chrome polished stems these valves deliver higher exhaust flow and resist wear in turbocharged applications. Engineered for direct fit they support increased boost and RPM without failure.
Key Features
- Chrome Polished Stems: Reduce friction against guides for longer life and consistent valve action
- Swirl Polished Heads: Improve exhaust gas evacuation and power output across RPM range
- One-Piece Forged Design: Provide strength to handle high heat and stress in performance engines
- 29mm Head Diameter (STD): Maintain OEM dimensions with enhanced flow characteristics for bolt-in performance
- 102.95mm Length: Exact spec including 5.95mm stem and 9mm tip for perfect seating and operation
Product Notes
- Recommended for use with upgraded valve springs like GSC 510mm or 25mm+ lift options
- Inspect valve guides and seats before installation for optimal sealing
- Packaged securely to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Valve lash set to 0.23mm +/- 0.03mm for exhaust side
- Compatible with OEM retainers seals and springs or GSC upgrades
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2015 | Mitsubishi | Lancer Evolution | GSR |
| 2008-2015 | Mitsubishi | Lancer Evolution | MR |
| 2015 | Mitsubishi | Lancer Evolution | Final Edition |
Why Choose GSC Power-Division?
- Developed for Evo competitors with proven track records in drag and road racing
- Made in USA with tight tolerances exceeding OEM standards
- Backed by lifetime warranty on manufacturing defects
Frequently Asked Questions
-
Q: Will these valves fit my 2010 Evo X GSR?
A: Yes direct replacement for all 2008-2015 Lancer Evolution X models with 4B11T 2.0L turbo engine including GSR MR and Final Edition -
Q: What material and finish do these valves have?
A: One-piece forged steel construction with chrome polished stems for wear resistance and swirl polished heads for flow 30-32rc seat hardness -
Q: What is the warranty and install process?
A: Lifetime warranty against defects. Requires cylinder head removal set lash after install and pair with matching springs for high boost
Shipping & Handling
- Method: Standard ground
- Availability: In stock - ships same or next business day
- Packaging: Protective box 6 x 4 x 2 inches
- Weight: 0.75 lbs
GSC Power Division
GSC Power Division is a manufacturer of precision-engineered camshafts, valve springs, and valvetrain components designed for high-performance and competition engines across domestic, import, and diesel platforms. Founded by engineers with deep roots in motorsport, GSC Power Division components are machined to exacting tolerances and heat-treated to survive the demands of forced induction and high-rpm applications that destroy stock valvetrain parts. The brand is particularly well-known in the Mitsubishi Evo, Subaru STI, Nissan RB, and Toyota 2JZ communities where aggressive camshaft profiles are essential for extracting maximum power from turbocharged four-cylinder and six-cylinder engines. Whether building for drag racing, road course competition, or a high-powered street car, GSC Power Division camshafts and valve springs are a proven upgrade path. Popular Upgrades GSC Power Division S1, S2, and S3 camshafts are the most popular selections, with each profile offering progressivel...
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