GSC P-D Subaru EJ257 w/Dual AVCS S1 Cams 266/264 Billet

This package includes a set of GSC Power Division S1 camshafts, specifically designed for Subaru EJ257 engines equipped with Dual AVCS. These camshafts are precision-machined from billet material, offering a durable and reliable upgrade for your engine's valvetrain. The S1 grind features a 266-degree intake duration and a 264-degree exhaust duration, carefully chosen to enhance airflow and improve engine performance without requiring extensive modifications to the valvetrain components.

The billet construction means these camshafts start as a solid piece of steel, which is then precisely machined to the desired profile. This method results in a stronger, more consistent camshaft compared to cast alternatives, making them well-suited for performance applications. The specific lift and duration figures of the S1 grind are optimized for the EJ257 engine's characteristics, aiming to increase horsepower and torque, particularly in the mid-to-upper RPM range. They are designed to work with the factory Dual AVCS system, allowing for improved engine response and efficiency across a wider operating range.

When installing these camshafts, it's important to follow the manufacturer's recommended procedures to ensure proper timing and valve lift. While these camshafts offer a significant performance improvement, they are not CARB approved and cannot be shipped to California. Please consult the manufacturer's installation guide for detailed instructions and any specific requirements for your vehicle's setup.