Description
For the 2008 and later Subaru STi EJ257 with Dual AVCS, GSC Power-Division offers billet S3 camshafts with a power range of 750–1000 WHP and a rev range of 4500–9500 RPM. To fully benefit from these camshafts, specific engine modifications are needed, such as a built bottom end (sleeved or closed deck recommended), built/ported heads (casting must be cleared for higher lift), and improved valve springs. For optimum idle characteristics, a standalone ECU or tune with speed density is highly recommended.
APPLICATIONS
- Subaru WRX STI (2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021)
FEATURES
- Check Pictures for cam placement. Long nose = Left Side, short nose = Right Side
- Due to the lobe size head castings will need to be machined down for clearance – Please check during the install
- Proper break in and running high zinc oil is a must on flat tappet engines
- Must be installed by an experienced technician
- Check AVCS advance during install – must be done by experienced engine builder
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