GM LS Hyd. Roller Cam 277LRR HR-113

The GM LS Hyd. Roller Cam 277LRR HR-113 from COMP CAMS is a purpose-built hydraulic roller camshaft designed for Gen III/IV LS-series engines seeking aggressive yet streetable performance. This camshaft serves builders and enthusiasts who demand reliable valve lift and duration without sacrificing daily-driver usability or requiring constant mechanical adjustment. Hydraulic roller designs eliminate solid-lifter complexity while delivering the efficiency gains of roller technology—making this an ideal choice for both naturally aspirated and moderately boosted LS applications.

This camshaft features 0.614-inch intake lift and 0.624-inch exhaust lift, paired with 277-degree intake and 293-degree exhaust duration at 0.050-inch lifter rise. The 113-degree lobe separation angle (LSA) balances overlap characteristics for smooth idle quality while maintaining aggressive mid-range and top-end power delivery across its 1,900–7,000 RPM operating window. The hydraulic roller design uses precision-ground lobes and hardened steel construction to minimize wear, reduce friction losses, and handle sustained high-RPM operation typical of street and strip builds. Rectangular port head compatibility ensures proper valve train geometry and optimized flow characteristics without modifications to factory or ported cylinder heads.

This camshaft is best suited for LS-swapped vehicles, crate motor builds, and engine rebuilds where peak horsepower and torque availability matter. Installation requires proper valve train setup, including compatible hydraulic roller lifters, pushrods, and rocker arms—all of which must be matched to the camshaft's specifications for reliable operation. The 277LRR profile works exceptionally well in street/strip configurations where drivers need smooth idle manners at stoplights and responsive power delivery during acceleration, making it a versatile choice for Gen III/IV LS platforms from 5.3L through 6.2L displacement variants.