SKU: 5039
GSC Power-Division 4G63T EVO 8-9 Stage 1 Beehive Valve Springs (1990-2006 Mitsubishi DSM & Lancer Evolution, Use Factory Retainers and Seats)
GSC Power-Division Stage 1 Beehive Valve Springs upgrade 4G63T engines in Mitsubishi Lancer Evolution 8-9 and DSM models like Eclipse GSX, GST, Talon TSi. These springs deliver 118 lbs seat pressure at 1.660 inches and 306 lbs open pressure at 1.150 inches max lift for precise valve control. The beehive shape cuts valvetrain mass by 35 percent over OEM dual springs, supporting 10,200 RPM reliably.
Key Features
- Beehive Design: 35 percent lighter than stock dual springs, reduces inertia for smoother high-RPM operation and less wear on valvetrain components
- Seat Pressure: 118 lbs at 1.660 inches installed height ensures valves stay seated during aggressive driving and boost
- Open Pressure: 306 lbs at 1.150 inches max lift with 280 lbs per inch rate handles stock cams or mild grinds without float
- Factory Compatibility: Works directly with OEM retainers and spring seats for drop-in install on Evo 8-9 and 4G63T DSM heads
- Premium Construction: Heat-treated chrome silicon steel withstands high heat and stress in turbocharged 4G63T applications
Product Notes
- Set includes 16 springs (8 intake, 8 exhaust) with coil bind height of 0.950 inches
- Free length 2.165 inches intake and exhaust, outer diameter 1.059 inches
- Ships in protective packaging to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Set installed height to 1.660 inches for correct seat pressure, verify with dial indicator
- Uses factory retainers, seats, and locks, no additional hardware required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003-2005 | Mitsubishi | Lancer | Evolution VIII MR |
| 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?
- Engine dyno and track tested for 4G63T reliability in racing applications
- Precise manufacturing tolerances ensure consistent spring rates across the set
- Lifetime warranty on spring failure when installed and used per specifications
Frequently Asked Questions
-
Q: Does this fit 2G DSM Eclipse GSX or Talon TSi with 4G63T?
A: Yes, compatible with factory valvetrain on 1990-1999 Mitsubishi Eclipse GST/GSX, 1990-1998 Eagle Talon TSi, and similar DSM models listed -
Q: What material are the springs made from?
A: High-temperature chrome silicon steel, heat treated for fatigue resistance and longevity in boosted 4G63T engines -
Q: What warranty coverage is provided?
A: GSC Power-Division lifetime warranty against breakage if springs stay within 10,200 RPM limit and proper installed height
Shipping & Handling
- Method: UPS or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure box measuring 8 x 6 x 4 inches
- Weight: 2.6 lbs
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