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SKU: 2025-8
GSC P-D 4B11T Chrome Polished Super Alloy Exhaust Valve - 29mm Head (STD) - SET 8 for 2008-2015 Mitsubishi Lancer Evolution X
Equip your 2008-2015 Mitsubishi Lancer Evolution X with the GSC P-D 4B11T exhaust valve set featuring 29mm standard head diameter and chrome polished super alloy construction. This complete set of 8 valves delivers reliable performance in high-boost and high-RPM applications for the 4B11T engine. Direct replacement enhances exhaust flow and withstands extreme heat cycles.
Key Features
- Super Alloy Construction: High-nickel Inconel-style alloy forged as one piece resists fatigue and maintains shape at temperatures over 1600°F
- Chrome Polished Stems: Mirror finish on 7.98mm stems cuts friction by 40% reduces guide wear and improves heat transfer to valve guides
- 29mm Head Diameter: Standard sizing preserves OEM port flow while adding strength for larger cams and turbo upgrades
- Extended Valve Length: 120.20mm overall length with 7.98mm tip ensures proper seal depth and spring retention in stock or ported heads
- Precision Tolerances: Stem held to +/- 0.0005 inches for drop-in fit and zero radial runout supporting valve train stability above 9000 RPM
Product Notes
- Replace valve seals and guides during installation for optimal sealing
- Inspect retainer and spring compatibility with aftermarket cams
- Packaged in foam-lined box to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Valve stem 7.98mm requires matching bronze guides for high boost
- No additional hardware needed uses factory retainers and seats
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2015 | Mitsubishi | Lancer Evolution X | GSR |
| 2008-2015 | Mitsubishi | Lancer Evolution X | MR |
| 2008-2015 | Mitsubishi | Lancer Evolution X | MR Final Edition |
| 2008-2015 | Mitsubishi | Lancer Evolution X | All 4B11T |
Why Choose GSC Power-Division?
- Race-proven in Evo X drag and time attack classes worldwide
- Engineered and tested on 40+ PSI boosted 4B11T dynos
- USA-assembled with Japanese forging for consistent quality
Frequently Asked Questions
-
Q: Will these valves fit my 2010 Evo X GSR?
A: Yes direct OEM replacement for all 2008-2015 Lancer Evolution X models equipped with the 4B11T 2.0L turbo engine -
Q: What makes the chrome polish different from stock?
A: Polished stems dissipate heat faster and reduce oil consumption by minimizing guide clearance wear over 50k miles of track use -
Q: Do I need upgraded springs with these valves?
A: Stock springs work for mild builds pair with GSC springs for cams over 11mm lift or boost above 30 PSI
Shipping & Handling
- Method: Standard ground shipping
- Availability: In stock - ships same or next business day
- Packaging: Foam inserts in 10x6x2 inch box
- Weight: 1.8 lbs
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