Description
The GSC Power-Division Billet S2 Camshaft Set is a high-performance valvetrain upgrade engineered for heavily modified Subaru EJ257 engines equipped with Dual AVCS. Manufactured by GSC Power-Division, the S2 camshafts are designed specifically for high horsepower applications, delivering maximum airflow and top-end power potential for serious performance builds.
Precision-machined from billet steel, the S2 cam profile is significantly more aggressive than entry-level cam options, making it ideal for built engines targeting 500 WHP and above. These camshafts are optimized for high-boost setups and are intended for use with upgraded turbo systems, ported cylinder heads, and fully built short blocks.
To fully utilize the S2 camshafts, a properly built engine configuration is required, including reinforced internals, ported heads, and advanced engine management tuning. This ensures safe operation and optimal performance under high load and high RPM conditions.
Upgraded valve springs are required due to the aggressive cam profile and increased valve lift. Beehive-style valve springs are strongly recommended to improve valvetrain stability and durability, especially in high-RPM applications.
Due to the increased lobe size, minor cylinder head casting clearance modification may be necessary during installation. Proper inspection and adjustment should be performed during assembly to ensure correct fitment.
Proper break-in procedure is essential for flat-tappet-style camshaft operation, including the use of high-zinc oil to ensure correct wear-in and long-term reliability. Installation should only be performed by an experienced technician familiar with performance engine builds.
FITMENT
- 2008+ Subaru STI
- EJ257 engine with Dual AVCS
- High horsepower built engine applications
- Suitable for 500+ WHP turbocharged setups
KEY FEATURES
- Billet steel high-performance camshaft construction
- S2 aggressive profile for high horsepower builds
- Optimized for Dual AVCS operation
- Designed for 500+ WHP applications
- Requires built motor and ported heads for best performance
- Strong top-end power and high-RPM capability
- Valve spring upgrade required
- Beehive springs recommended for improved stability
- May require head clearance modification
- Designed for advanced performance engine builds
INSTALL NOTES
- Verify camshaft orientation before installation (Long nose = Left side, Short nose = Right side)
- Check head casting clearance due to aggressive lobe design
- Proper break-in procedure required using high-zinc oil
- Installation must be performed by an experienced engine builder or technician
