GSC Conical Valve Spring Kit w/ Titanium Retainers & Chromoly Seats – Subaru EJ Turbo (GSC5076)
Reliable Valvetrain Control for High-Boost EJ Builds
The GSC Power-Division Conical Valve Spring Kit is designed for Subaru DOHC EJ Turbo platforms. This complete setup includes 16 conical valve springs, 16 titanium retainers, and 16 chromoly spring seats—engineered to handle elevated RPM and boost with precision and durability.
Conical Geometry for Harmonic Damping
With a tapered coil profile and progressive spacing, conical springs naturally absorb valvetrain shock and suppress harmonics. Compared to cylindrical or beehive designs, conical springs offer superior stability—reducing wear and extending component life in high-output turbocharged engines.
Surface & Heat Treatment for Longevity
Each spring is finished with a super-polished surface and treated through a patented multi-step heat process. The result is a high-performance spring that supports aggressive cam profiles, high RPM operation, and elevated boost pressure without compromise.
Technical Specifications
| Setup | Coil Bind (in) | Install Height (in) | Seat Pressure (lbs) | Open Pressure @ 11.5mm Lift | Max Valve Lift (in) |
|---|---|---|---|---|---|
| Conical | 0.807 | 1.318 | 84 | 233 @ 0.868" | 0.450 |
Performance Limits
- Max RPM: 10,000 RPM
- Max Boost: 40 psi
Fitment Guide
- 2002–2005 Subaru WRX 2.0L Turbo DOHC (EJ205)
- 2004–2007 Subaru WRX STI 2.5L Turbo DOHC (EJ257)
- 2006–2014 Subaru WRX 2.5L Turbo DOHC (EJ255)
- 2008–2021 Subaru WRX STI 2.5L Turbo DOHC (EJ257)
- 2004–2006 Subaru Baja Turbo 2.5L DOHC (EJ255)
- 2005–2009 Subaru Legacy GT 2.5L Turbo DOHC (EJ255)
- 2005–2009 Subaru Outback XT 2.5L Turbo DOHC (EJ255)
- 1994–1998 Subaru Legacy Turbo 2.2L DOHC (EJ22T)
- 1992–1996 Subaru Impreza WRX 2.0L Turbo DOHC (EJ20G)
- 1996–2000 Subaru Impreza WRX STI 2.0L Turbo DOHC (EJ20K)
- 2001–2005 Subaru Impreza WRX STI JDM 2.0L Turbo DOHC (EJ207)
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