GSC High Pressure Conical Valve Spring Kit w/ Titanium Retainers – Mitsubishi 4G63T (GSC5098)
Built for High RPM and Boosted 4G63T Applications
The GSC Power Division high-pressure conical valve spring kit (PN GSC5098) is engineered for Mitsubishi 4G63T engines pushing serious RPM and boost. This complete kit includes 16 conical valve springs, 16 lightweight titanium retainers, and 16 upgraded spring seats, offering enhanced valve control and durability for aggressive cam profiles and forced induction setups.
Spring Pressure & Lift Specs
- Intake Seat Pressure: 105 lbs @ 1.495"
- Exhaust Seat Pressure: 111 lbs @ 1.475"
- Open Pressure: 267 lbs @ 1.003" (Intake & Exhaust)
- Maximum Valve Lift: 0.492" Intake / 0.472" Exhaust
- Coil Bind: 0.950"
Performance Limits
- Max RPM: 10,500
- Max Boost: 50 psi
- Cam Compatibility: Supports up to 12.5mm intake lift / 12.0mm exhaust lift
Product Details
- Part Number: GSC5098
- Fitment: Mitsubishi 4G63T engines
- Includes: 16 conical valve springs, 16 titanium retainers, 16 chromoly spring seats
Why Choose Conical Springs?
Conical springs offer a progressive spring rate and reduced valvetrain mass, allowing for tighter valve control at elevated RPM. GSC’s design supports OEM valve keepers or their GSC1003 keeper kit, eliminating the need for aftermarket locks that may introduce angle mismatch. Ideal for high-performance builds, this kit delivers the stability and strength needed to push your 4G63T to the next level.
Fitment:
- 1995 - 1999 Mitsubishi Eclipse GS-T/GSX 2.0L Turbo (4G63T)
- 1990 - 1994 Mitsubishi Eclipse 2.0L Turbo (4G63T)
- 1991 - 1992 Mitsubishi Galant VR-4 2.0L Turbo (4G63T)
- 1992 - 1996 Mitsubishi Lancer Evolution I–III 2.0L Turbo (4G63T)
- 1996 - 2003 Mitsubishi Lancer Evolution IV–VII 2.0L Turbo (4G63T)
- 2003 - 2007 Mitsubishi Lancer Evolution VIII–IX 2.0L Turbo (4G63T)
- 1990 - 1998 Eagle Talon TSi 2.0L Turbo (4G63T)
- 1990 - 1994 Plymouth Laser RS Turbo 2.0L Turbo (4G63T)
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