GSC Mitsubishi Evolution 4-8 4G63T Billet R1 Camshafts 268/268

When you open this box, you're getting a pair of GSC Power Division R1 camshafts, specifically designed for the Mitsubishi Evolution 4 through 8 models with the 4G63T engine. These aren't just any camshafts; they're precision-machined from solid billet steel, which is a much stronger foundation than cast cams. This means they can handle more aggressive valve events and higher spring pressures without flexing or wearing out prematurely. The 268-degree duration on both the intake and exhaust sides is a popular choice for enthusiasts looking for a noticeable bump in power across the RPM range, especially when paired with other engine modifications.

The R1 profile is known for its broad powerband, making it a solid option for street cars that see occasional track use or spirited driving. You'll find that these cams offer improved throttle response and a significant increase in horsepower, particularly in the mid-to-upper RPMs, without being so radical that they make the car difficult to drive daily. The billet construction also allows for tighter tolerances and more consistent performance over time compared to older cam designs. Installing these will require attention to valve spring upgrades, as the stock springs might not be sufficient for the increased lift and duration.

For those rebuilding the top end or looking to extract more performance from their 4G63T, these GSC R1 cams are a well-built component that offers a substantial upgrade. Remember that these camshafts are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper setup and any required supporting modifications.