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SKU: 2003-8 | UPC: GSC2003-8
GSC P-D 4G63T Evo 1-9 / 90-98 DSM Chrome Polished Exhaust Valve - 31.5mm Head (+1mm) - SET 8
GSC Power-Division chrome polished exhaust valves feature 31.5mm oversized heads and fit the 4G63T engine in Mitsubishi Lancer Evolution 1-9 models and 1990-1999 DSM vehicles including Eclipse GST GSX Talon TSi Galant VR-4 and Laser RS. This set of 8 one-piece forged valves improves exhaust flow and withstands high heat in performance engines. Stem diameter measures 6.48mm with overall length of 109.9mm for direct compatibility after machining.
Key Features
- Oversized 31.5mm head +1mm: Boosts exhaust flow volume for quicker cylinder scavenging and power gains in turbocharged 4G63T builds
- Chrome polished stems: Cuts friction against guides enhances heat dissipation and extends valve life under high RPM stress
- Stellite bead welded seats: Delivers seat recession resistance stronger than coatings for long-term reliability in racing
- Swirl polished backs and tops: Sharpens airflow over valve surfaces to support higher boost levels without restriction
- One-piece forged steel build: Maintains structural integrity at redline with bead blast finish for smooth operation
Product Notes
- Requires valve seat machining for +1mm oversized heads during installation
- Inspect valve springs and retainers for compatibility with performance camshafts
- Packages in protective foam-lined box measuring 6in x 4in x 2in
Installation Notes
- Professional installation recommended.
- Perform three-angle valve job to match oversized heads and stellite seats
- Compatible with stock DSM Evo heads no special hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1990-1998 | Eagle | Talon | TSi |
| 1990-1994 | Mitsubishi | Eclipse | GS |
| 1990-1999 | Mitsubishi | Eclipse | GST |
| 1990-1999 | Mitsubishi | Eclipse | GSX |
| 1996-1999 | Mitsubishi | Eclipse | Spyder GST |
| 1991-1992 | Mitsubishi | Galant | VR-4 |
| 2005-2006 | Mitsubishi | Lancer Evolution | |
| 2005-2006 | Mitsubishi | Lancer Evolution | MR |
| 2005-2006 | Mitsubishi | Lancer Evolution | RS |
| 2006 | Mitsubishi | Lancer Evolution | SE |
| 1990-1994 | Plymouth | Laser | RS |
Why Choose GSC Power-Division?
- Leads valvetrain components for 4G63T in drag road race applications worldwide
- Builds valves with submerged arc stellite welding unmatched by competitors
- Engineers every dimension for DSM Evo cylinder heads from dyno testing
Frequently Asked Questions
-
Q: Will these valves fit all Evo 1-9 models?
A: Yes set matches 4G63T heads in Evo 1 through 9 including US 2003-2006 Lancer Evolution variants after standard +1mm machining -
Q: What finish and material details apply?
A: One-piece forged steel with chrome polished stems stellite bead seats swirl polished heads and bead blast surface for flow and wear resistance -
Q: What warranty coverage exists?
A: GSC Power-Division offers limited lifetime warranty against manufacturing defects when installed by certified shop
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Secure foam-lined box 6 x 4 x 2 inches
- Weight: 1.0 lb product 1.5 lb shipping
GSC Power Division
GSC Power Division is a manufacturer of precision-engineered camshafts, valve springs, and valvetrain components designed for high-performance and competition engines across domestic, import, and diesel platforms. Founded by engineers with deep roots in motorsport, GSC Power Division components are machined to exacting tolerances and heat-treated to survive the demands of forced induction and high-rpm applications that destroy stock valvetrain parts. The brand is particularly well-known in the Mitsubishi Evo, Subaru STI, Nissan RB, and Toyota 2JZ communities where aggressive camshaft profiles are essential for extracting maximum power from turbocharged four-cylinder and six-cylinder engines. Whether building for drag racing, road course competition, or a high-powered street car, GSC Power Division camshafts and valve springs are a proven upgrade path. Popular Upgrades GSC Power Division S1, S2, and S3 camshafts are the most popular selections, with each profile offering progressivel...
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