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SKU: 2007-8 | UPC: GSC2007-8
GSC Power-Division 4G63T Evo1-9 DSM 90-2006 Chrome Polished Super Alloy Exhaust Valve 31.5mm Head +1mm Set of 8
GSC Power-Division exhaust valves for 4G63T engines fit Mitsubishi Lancer Evolution 1-9 DSM Eclipse Talon Laser Galant 1990-2006. This set of 8 has 31.5mm head +1mm over stock for better exhaust flow and power at high RPM. Chrome polished stems and super alloy build endure extreme heat and boost in turbo DOHC 4G63 heads up to 40psi with dual springs.
Key Features
- Super Alloy Material: Forged one-piece design resists fatigue withstands temperatures over 1600°F for durability in high-boost turbo setups
- Chrome Polished Stem: 6.98mm diameter reduces friction on guides dissipates heat 30% faster than stock for reliable valve action
- Swirl Polished Head: 31.5mm diameter +1mm over stock swirl ground top increases exhaust velocity scavenging for improved cylinder filling
- Precise Dimensions: Head thickness 4.3mm stem length 110.95mm overall length 115.25mm for drop-in fit in 4G63 DOHC heads with correct lash
- Set of 8 Exhaust Valves: Matched set ensures even flow across cylinders supports high boost applications
Product Notes
- Pair with GSC valve springs retainers seals for complete valvetrain upgrade
- Check valve guide clearance before install tolerances under 0.004 inch required
- Packed in foam-lined 6 x 4 x 2 inch box protects valves during transit
Installation Notes
- Professional installation recommended.
- Set valve lash to 0.011-0.013 inch hot after +1mm head install
- Compatible with OEM or aftermarket retainers no machining needed on head
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?
- Engineered for DSM Evo race teams with track record in drag road racing
- Machined to micron tolerances in USA for zero defects
- Backed by testing on 1000whp 4G63 builds
Frequently Asked Questions
-
Q: Will these valves fit all 4G63T Evo 1-9 models?
A: Yes direct fit for all Mitsubishi Lancer Evolution 1-9 4G63 DOHC turbo heads including USDM 2003-2006 Evo 8/9 -
Q: What finish and material details?
A: One-piece super alloy valves with chrome plated stems for corrosion resistance swirl polished heads for 12% better flow than stock -
Q: What about warranty and setup?
A: Lifetime defect warranty when installed by certified shop measure installed height lash precisely for dual springs
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Foam protected 6 x 4 x 2 inch box
- Weight: 0.8 lbs
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