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GSC2027-8-GSC P-D 4B11T Chrome Polished Super Alloy Exhaust Valve - 30mm Head (+1mm) - SET 8-Valves-GSC Power Division
GSC P-D 4B11T Chrome Polished Super Alloy Exhaust Valve - 30mm Head (+1mm) - SET 8 - Black Ops Auto Works
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GSC P-D 4B11T Chrome Polished Super Alloy Exhaust Valve - 30mm Head (+1mm) - SET 8

GSC2027-8
GSC2027-8
Valves
3 Units In Stock - Ships Next Business Day
$ 302.96 $ 257.52
$ 257.52

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

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GSC Power Division

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