GSC S3 Billet Camshaft Set Subaru EJ255 / EJ257 Intake AVCS (GSC7025S3)
Engineered for Extreme Power EJ Builds
The GSC Power-Division S3 Billet Camshaft Set is designed for USDM Subaru WRX and STI models equipped with intake-only AVCS. These aggressive cams are built for high-horsepower applications targeting 7501000 WHP and a rev range of 45009500 RPM.
Recommended Engine Setup
- Built bottom-end (sleeved or closed deck strongly recommended)
- Ported cylinder heads with casting clearance for high lift
- Upgraded valve springs required for safe high-RPM operation
- Standalone ECU or speed density tune recommended for proper idle behavior
Installation Notes
- Head castings may require minor filing due to lobe size
- Flat tappet engines must use high-zinc oil and follow proper break-in procedures
- Professional installation is strongly advised
Camshaft Identification
Refer to product images for cam placement:
Long nose = Left Side
Short nose = Right Side
Camshaft Specifications
| Camshaft | ADV Duration | Duration @ 0.040" | Peak Lift | Center Line |
|---|---|---|---|---|
| Intake | 280° | 240° | 11.55mm | 130° |
| Exhaust | 280° | 241° | 11.60mm | 115° |
Fitment Guide
- 2004–2007 Subaru WRX STI 2.5L Turbo DOHC (EJ257 Intake AVCS)
- 2006–2014 Subaru WRX 2.5L Turbo DOHC (EJ255 Intake AVCS)
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