SKU: 2024-8
GSC P-D 4B11T 21-4N Chrome Polished Intake Valve – 36mm Head (+1mm) – SET 8 for 2008-2016 Mitsubishi Lancer Evolution X
GSC Power-Division intake valves deliver precise engineering for the Mitsubishi 4B11T engine in Lancer Evolution X models from 2008 to 2016. This set of 8 features a 36mm head diameter +1mm over stock for greater airflow volume alongside 21-4N stainless construction that handles high boost and RPM. Chrome polishing reduces friction for reliable sealing and extended service life in performance setups.
Key Features
- 36mm Head Diameter (+1mm O/S): Increases intake flow capacity by larger port matching to support 500+ whp builds without restricting air velocity
- 21-4N Stainless Steel: High-nickel alloy resists fatigue and heat up to 1600°F ideal for turbocharged 4B11T applications
- Chrome Polished Finish: Lowers valve guide wear by 50% and enhances seat life through smoother surface and better lubrication retention
- 5.96mm Stem / 104.60mm Length: Matches OEM geometry for drop-in stem fit with upgraded springs while maintaining valve train stability
- Complete Set of 8: Full intake replacement ensures balanced flow across all cylinders for even power delivery
Product Notes
- Valve seat machining required for +1mm oversized head to achieve proper interference fit
- Inspect valve guides for wear before installation and consider bronze guides for extreme builds
- Packaged in individual protective sleeves to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Machine valve seats 0.5-1.0mm for 36mm head using multi-angle cutter for optimal flow
- Compatible with OEM retainers and GSC valve springs part 2003 or equivalents
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 |
| 2009-2014 | Mitsubishi | Lancer | Ralliart |
Why Choose GSC Power-Division?
- Proven in NHRA drag racing and NASA time attack with multiple championship teams
- CNC machined in the USA with tolerances under 0.0005 inches for repeatability
- Backed by defect warranty when installed by certified shops
Frequently Asked Questions
- Q: Will these valves fit all 2008-2015 Mitsubishi Evo X models?
A: Yes they directly fit GSR MR and Final Edition submodels with the stock 4B11T cylinder head along with 2009-2014 Lancer Ralliart - Q: What makes the chrome polish different from standard valves?
A: Chrome polish creates a harder micro-finish that cuts guide wear and improves heat transfer for consistent performance over 100k miles - Q: Do I need new valve springs with these?
A: Stock springs work for mild builds under 350whp but upgrade to GSC springs for 400+whp to control float at 9000+RPM
Shipping & Handling
- Method: Standard ground
- Availability: In stock – ships same or next business day
- Packaging: Individual sleeves in 6 x 4 x 2 inch box
- Weight: 0.95 lbs
Reviews
There are no reviews yet.