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GSC2023-8-GSC P-D 4B11T 23-8N Chrome Polished Exhaust Valve - 30mm Head (+1mm) - SET 8-Valves-GSC Power Division
GSC P-D 4B11T 23-8N Chrome Polished Exhaust Valve - 30mm Head (+1mm) - SET 8 - Black Ops Auto Works
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GSC P-D 4B11T 23-8N Chrome Polished Exhaust Valve - 30mm Head (+1mm) - SET 8

GSC2023-8
GSC2023-8
Valves
7 Units In Stock - Ships Next Business Day
$ 191.60 $ 162.86
$ 162.86

SKU: 2023-8

GSC P-D 4B11T 23-8N Chrome Polished Exhaust Valve - 30mm Head (+1mm) - SET 8 for 2008-2015 Mitsubishi Lancer Evolution X

GSC Power-Division exhaust valves deliver reliable performance for the 4B11T engine in 2008-2015 Mitsubishi Lancer Evolution X models. This set of 8 features a 30mm head diameter with +1mm oversize for greater exhaust flow during high-RPM and boosted operation. The chrome polished finish and 23-8N stainless steel construction handle extreme heat in Evo X builds.

Key Features

  • 23-8N Stainless Steel: Forged one-piece design withstands high exhaust gas temperatures in turbocharged 4B11T engines
  • Chrome Polished Finish: Improves heat dissipation and resists carbon buildup for longer valve life
  • 30mm Head Diameter (+1mm): Increases exhaust flow over stock for better top-end power and response
  • 5.95mm Stem Diameter: Matches OEM guides with precise tolerances for secure fit and sealing
  • 108.67mm Overall Length: Direct replacement with 9mm tip length and 2.5mm back-cut for coil spring compatibility

Product Notes

  • Pair with matching +1mm valve seats for proper clearance and sealing
  • Inspect valve guides during installation for wear
  • Packaged in protective GSC box to prevent damage

Installation Notes

  • Professional installation recommended.
  • Machine valve seats to accommodate +1mm oversize head diameter
  • Compatible with GSC valve springs and retainers for 4B11T

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 Final

Why Choose GSC Power-Division?

  • Proven in professional racing Evo X engines worldwide
  • Focus on valvetrain durability for high-boost reliability
  • Precision CNC machining ensures consistent valve geometry

Frequently Asked Questions

  • Q: Will these valves fit my 2010 Evo X GSR?
    A: Yes, these are direct replacements for all 2008-2015 Lancer Evolution X models with the 4B11T engine including GSR, MR, and Final Edition submodels
  • Q: What material and finish are used?
    A: Forged from 23-8N stainless steel with swirl polishing on the face and chrome polishing on the stem and head for heat resistance and sealing
  • Q: What is the warranty and install advice?
    A: GSC offers a limited lifetime warranty against defects. Professional installation required due to oversize head needing seat machining

Shipping & Handling

  • Method: Standard ground shipping
  • Availability: In stock - ships same or next business day
  • Packaging: Secure GSC box approximately 12 x 8 x 2 inches
  • Weight: 1.1 lbs

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