GM LS LSR Cam - 277LRHR12

The GM LS LSR Cam 277LRHR12 by COMP CAMS is a high-performance hydraulic roller camshaft engineered for serious LS-series engine builders and enthusiasts seeking reliable power across a broad RPM band. This camshaft is designed for street and strip applications where consistent valve timing, durability, and responsive lift characteristics are non-negotiable. Whether you're upgrading a daily-driver LS or building a weekend warrior, the 277LRHR12 delivers the mechanical foundation needed for solid mid-range and upper-RPM performance without requiring complex valve train adjustments.

This camshaft features a cathedral-port profile optimized for LS-series cylinder heads, with intake and exhaust lift values of 0.614 and 0.621 inches respectively, paired with aggressive duration specs of 277 and 285 degrees. The 113-degree lobe separation angle promotes smooth idle quality while maximizing mid-to-upper RPM scavenging. Hydraulic roller lifters eliminate the need for manual valve adjustment and reduce friction, extending component life while improving reliability. The operational RPM range spans 1900 to 7000, making it versatile for naturally aspirated engines, supercharged platforms, and even conservative nitrous applications where predictable performance is critical.

Builders selecting the GM LS LSR Cam 277LRHR12 benefit from COMP CAMS' decades of engineering expertise and quality control in OEM and aftermarket applications. This camshaft integrates directly into all GM LS-series engines—including LS1, LS2, LS3, LS7, and LS9 platforms—provided the hydraulic roller lifter bucket configuration is present. Installation requires proper valve lash setup and confirmation of piston-to-valve clearance; professional engine builders typically confirm clearance before final assembly. With a shipping weight of 9.9 lbs, this single camshaft is ready for immediate integration into your LS build.