GSC Dual Conical Valve Spring Kit w/ Titanium Retainers & Chromoly Seats – Subaru EJ Turbo (GSC5074)
High-RPM Valvetrain Control for EJ Turbo Engines
The GSC Power-Division Dual Conical Valve Spring Kit is engineered for Subaru DOHC EJ Turbo platforms. This complete kit includes 16 dual conical valve spring sets, 16 titanium retainers, and 16 chromoly spring seats—designed to deliver precise valve control under extreme RPM and boost conditions.
Dual Conical Design for Maximum Stability
With progressive coil spacing and diameter variation, the dual conical spring design naturally dampens valvetrain harmonics. This reduces shock and wear, extending component life while supporting aggressive cam profiles and high-output turbo setups.
Technical Specifications
| Setup | Coil Bind (in) | Install Height (in) | Seat Pressure (lbs) | Open Pressure @ 11.5mm Lift | Max Valve Lift (in) |
|---|---|---|---|---|---|
| Dual Conical | 0.790 | 1.368 / 1.092 | 95 | 233 @ 0.915" / 0.639" | 0.512 |
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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