LS1/LS6 Xtreme RPM High Hyd. Roller Cam XR281HR

The LS1/LS6 Xtreme RPM High Hyd. Roller Cam XR281HR by COMP CAMS is a precision-engineered hydraulic roller camshaft designed for GM LS-series engines seeking elevated performance without the complexity of solid roller conversions. This cam profile delivers aggressive lift and extended duration to unlock horsepower in naturally aspirated and moderately boosted applications, making it an ideal choice for street/strip builds, restorations, and engine swaps where reliability and drivability matter as much as power output.

Built with a 0.571-inch intake and 0.573-inch exhaust lift across a 281/283-degree duration window and 112-degree lobe separation angle, this XR281HR profile is optimized for the 2200–7200 RPM powerband—a sweet spot for LS-series engines running stock or lightly modified cylinder heads. The hydraulic roller design uses self-adjusting valve lifters to automatically maintain proper clearance, eliminating the need for manual lash adjustment and reducing tune-up labor. COMP CAMS' advanced grinding and quality control ensure consistent lobe geometry, oil hole placement, and hardened steel construction to withstand extended high-RPM operation and repeated valve train stress.

This camshaft is purpose-built for LS1 and LS6 engines and compatible with all modern LS-based platforms, including swaps into third-generation Camaros, Firebirds, and hot-rod applications. Installation requires standard camshaft replacement procedures—no exotic tools or machine work—making it accessible to experienced DIY builders and professional shops alike. Pair the XR281HR with a quality valve spring upgrade and fuel-tuning adjustments to fully realize its performance potential while maintaining streetable manners and long-term durability.