GSC P-D Mitsubishi Evolution 9 4G63T 260/268 Billet R1R Rally Camshafts

When you're building a rally-focused Mitsubishi Evolution 9 with the 4G63T engine, you're looking for camshafts that can handle the demands of competition. This set from GSC Power Division features a 260-degree intake duration and a 268-degree exhaust duration, specifically ground for rally applications. These are billet camshafts, meaning they start as a solid piece of steel that's then machined to shape, offering a strong foundation for the cam lobes.

The R1R grind is designed to provide a noticeable improvement in the mid-range and top-end power band, crucial for getting through stages quickly. Because these are billet cams, they offer a well-built and durable option compared to cast cams. The specific lift and duration numbers are chosen to work well with the factory head and valve springs on many Evo 9s, though for serious competition, upgrading valve springs is often recommended to ensure proper valve control at higher RPMs. This set is intended for serious performance builds and is not CARB approved, so it cannot be shipped to California.

If you're aiming for a competitive edge on the rally stage, these GSC Power Division camshafts are a solid option. They are a direct replacement for your stock camshafts, but they will require proper tuning to realize their full potential. Make sure you have your ECU remapped after installation to take advantage of the improved airflow characteristics.