S1 Camshaft Set 264 Intake/Exhaust

The GSC Power-Division S1 Camshafts are high-performance camshafts engineered for the 2008+ Subaru STI EJ257B engine with Dual AVCS. These billet camshafts are suitable for builds utilizing stock-frame turbochargers up to 500 WHP (GT35R upgrades). With an intake and exhaust duration of 264°, these camshafts offer enhanced airflow and performance. The intake cam features a peak lift of 10.80mm and a center line of 125°, while the exhaust cam has a peak lift of 10.50mm and a center line of 128°. The "S1" designation indicates a profile optimized for a broad powerband. Installation of these camshafts requires upgraded valve springs; Beehive valve springs are recommended for optimal performance, though not strictly required. Due to the lobe size, slight filing of the head castings may be necessary for clearance during installation. The set includes four camshafts, with specific placement indicated by nose length (long nose for left side, short nose for right side). These camshafts are designed as a direct fit for Subaru EJ257B engines equipped with Dual AVCS, offering a performance upgrade without the need for additional machining.