GSC Power-Division S1 camshafts for the 2008+ STI EJ257B With Dual AVCS. Good for stock turbo or up to 500WHP (GT35R) upgrades. Upgraded valve springs are required; Beehive valve springs are recommended but not required.
Due to the lobe size, head castings will need to be filled down slightly for clearance.
- Intake 266 / 225 @ .040″ / Peak Lift 10.7MM / Centerline AVCS
- Exhaust 264 / 222 @ .040″ / Peak Lift 10.4mm / Centerline AVCS
- Requires upgraded valve springs
- Install to OEM shim spec’s for intake and exhaust