GSC S1 Billet Camshaft Set – Subaru EJ257 Dual AVCS (GSC7026S1)
Optimized for Turbo Response and Street Power
The GSC Power-Division S1 Billet Camshaft Set is designed for 2008+ Subaru STI models equipped with the EJ257B engine and Dual AVCS. These cams are ideal for stock location turbos or builds pushing up to 500 WHP, including setups with GT35R-class upgrades.
Spring & Install Requirements
- Upgraded valve springs are required for safe high-RPM operation
- Beehive springs are recommended for best performance, but not mandatory
- Head castings may require minor clearance work due to lobe size
- 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 | 264° | 226° | 10.80mm | 125° |
| Exhaust | 264° | 222° | 10.50mm | 128° |
Fitment Guide
- 2008–2021 Subaru WRX STI 2.5L Turbo DOHC (EJ257B Dual AVCS)
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