SKU: 2027-8
GSC P-D 4B11T Chrome Polished Super Alloy Exhaust Valve – 30mm Head (+1mm) – SET 8 | 2008-2015 Mitsubishi Lancer Evolution X
GSC Power-Division exhaust valves deliver reliable performance for 4B11T engines in the 2008-2015 Mitsubishi Lancer Evolution X. This set of 8 features 30mm head diameter and +1mm stem length for better exhaust evacuation and compatibility with aggressive cam profiles. Built to endure high boost and RPM in modified turbo setups.
Key Features
- Super Alloy Material: Forged one-piece design resists fatigue and handles temperatures over 2200°F for long-term durability in forced induction applications
- Chrome Polished Finish: Improves heat dissipation from the valve head and minimizes stem friction for smoother operation
- 30mm Head Diameter: +1mm sizing optimizes exhaust flow while maintaining velocity for responsive power gains
- +1mm Stem Length: 110.50mm overall length supports high-lift camshafts without clearance issues
- Precision Specs: 5.95mm stem diameter and 4.90mm head thickness ensure drop-in fit with OEM guides and seats
Product Notes
- Pair with GSC valve springs 4403-8 for high-RPM reliability
- Inspect valve guides during installation for wear
- Ships in protective foam-lined box to prevent damage
Installation Notes
- Professional installation recommended.
- Lap valves for perfect seal using three-angle seats
- Compatible with OEM retainers and GSC titanium retainers
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?
- Proven in drag racing and time attack builds
- USA-manufactured with CNC machining for consistency
- Tested to exceed stock valve limits under 40+ psi boost
Frequently Asked Questions
- Q: Do these valves fit stock 4B11T cylinder heads?
A: Yes direct OEM replacement for all 2008-2015 Evo X 4B11T heads with no modifications needed - Q: What makes the chrome polish different from stock?
A: Polished chrome layer on head and stem accelerates heat transfer away from combustion chamber and cuts wear - Q: Are upgraded springs required?
A: Stock springs work for mild builds but upgrade to GSC 4403-8 for cams over 272 duration or 30 psi boost
Shipping & Handling
- Method: Standard Ground
- Availability: In stock – ships same or next business day
- Packaging: Foam-protected set box 6 x 4 x 2 inches
- Weight: 0.7 lbs
Reviews
There are no reviews yet.