GSC S3 Billet Camshaft Set – Subaru EJ257 Dual AVCS (GSC7026S3)
Designed for Extreme Power and RPM Range
The GSC Power-Division S3 Billet Camshaft Set is built for 2008+ Subaru STI models equipped with the EJ257 engine and Dual AVCS. These cams are engineered for high-output builds pushing 750–1000 WHP and revving between 4500–9500 RPM. They deliver aggressive lift and duration for serious turbocharged applications.
Recommended Engine Setup
- Forged bottom-end (sleeved or closed deck recommended)
- Ported cylinder heads with clearance for high-lift lobes
- Upgraded valve springs required
- Standalone ECU or speed-density tune recommended for stable idle
Installation Notes
- Head castings may require machining for lobe clearance
- Flat tappet engines must use high-zinc oil and follow proper break-in procedures
- Cam placement: Long nose = Left Side, Short nose = Right Side
- AVCS advance must be verified during install by a skilled engine builder
- Professional installation is strongly advised
Camshaft Specifications
| Camshaft | ADV Duration | Duration @ 0.040" | Peak Lift | Center Line |
|---|---|---|---|---|
| Intake | 280° | 240° | 11.55mm | 130° |
| Exhaust | 280° | 241° | 11.60mm | 128° |
Fitment Guide
- 2008–2021 Subaru WRX STI 2.5L Turbo DOHC (EJ257 Dual AVCS)
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