SKU: 5062
GSC P-D Mitsubishi 4B11T High Pressure Single Conical Valve Spring and Ti Retainer Kit 2008-2015 Lancer Evolution X
Upgrade your Mitsubishi 4B11T engine with the GSC Power-Division high pressure single conical valve spring and titanium retainer kit designed specifically for 2008-2015 Lancer Evolution X models. This kit supports extreme boost levels and high RPM operation while maintaining valve control for consistent power delivery. Engine builders rely on these components for turbocharged setups pushing beyond stock limits.
Key Features
- Single Conical Design: Reduces valve train harmonics and mass for smoother high RPM stability up to 10,000 RPM
- High Pressure Rating: 125 lbs max seat load and 90 lbs open load at 0.465″ lift to handle 40+ PSI boost without coil bind
- Titanium Retainers: 10 gram lightweight construction cuts valvetrain inertia for faster revving and reduced wear
- Precise Dimensions: Installed height 1.378″ block height 1.181″ outer diameter 1.000″ inner 0.850″ with 5.9 total coils
- Complete Kit: Includes 16 springs and 16 retainers with matched tolerances for drop-in reliability on 4B11T heads
Product Notes
- Superfinished for extended fatigue life in aggressive cam and turbo applications
- Pair with GSC valve seals for optimal oil control during high lift events
- Kit weight approximately 1.8 lbs ships in protective foam-lined box
Installation Notes
- Professional installation recommended.
- Requires valve spring compressor tool for safe removal and installation on 4B11T cylinder head
- Compatible with stock keepers and GSC chromoly dual valve springs if upgrading retainers separately
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 |
| 2009-2015 | Mitsubishi | Lancer | Ralliart |
Why Choose GSC Power-Division?
- Proven in World Rally Championship and drag racing Evo X builds
- Dyno tested for consistent pressure retention over 100,000 cycles
- CNC machined in USA with rigorous stress testing for track durability
Frequently Asked Questions
- Q: Will this kit fit my 2010 Evo X GSR with stock head?
A: Yes direct bolt-on for all 2008-2015 4B11T engines including GSR MR and Final Edition with no head machining required - Q: What material are the springs made from?
A: Premium chromoly steel with shot peening and superfinishing for superior fatigue resistance under high boost - Q: Does GSC offer a warranty on this valvetrain kit?
A: Limited lifetime warranty against spring failure when installed by certified shops and used with compatible components
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Secure GSC branded box 6x6x4 inches
- Weight: 1.8 lbs
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