GM LS LSR Cam - 285LRRHR13

The COMP Cams GM LS LSR Cam (part number 54-470-11) is a hydraulic roller camshaft engineered for General Motors LS-series engines requiring solid lift profiles and extended RPM capability. This LSR rectangular port camshaft delivers 0.621-inch intake lift and 0.624-inch exhaust lift across a 285-degree intake and 301-degree exhaust duration window, with a 113-degree lobe separation angle optimized for street and mild performance applications.

The 2200-to-7200 RPM operating range positions this camshaft for engines that blend street drivability with moderate power gains. The hydraulic roller design provides the precision valve timing that modern LS engines demand while eliminating the maintenance requirements of solid lifters. The asymmetrical lobe profile—with higher exhaust duration than intake—helps optimize scavenging efficiency without sacrificing low-end torque. This specification set is particularly effective in naturally aspirated LS applications where responsiveness across a broad powerband matters more than peak RPM aggression.

This camshaft suits LS engine builders and rebuilders preparing street cars, weekend track vehicles, or restorations where a factory-compatible yet performance-enhanced valve event is the goal. The rectangular port design ensures compatibility with standard LS cylinder heads, and the hydraulic roller lifter architecture simplifies installation for builders already committed to LS architecture. Proper valve lash setup and quality pushrods are essential to realizing the camshaft's full potential.

COMP Cams maintains a strong reputation in the performance engine community for precision manufacturing and consistent lobe geometry. The GM LS LSR profile is one of the brand's proven configurations, favored by shops that prioritize reliability and straightforward bolt-in installation over extreme performance boundaries.