GM LS LSR Hyd Roller Cam LS272PU-12

The COMP Cams GM LS LSR Hydraulic Roller Cam LS272PU-12 is a high-lift roller camshaft engineered for naturally aspirated GM LS-series engines requiring aggressive valve timing and flow characteristics. This hydraulic roller cam delivers 0.541 inches of lift on both intake and exhaust sides with a 272-degree intake and 278-degree exhaust duration, optimized around a 112-degree lobe separation angle. Designed for engines targeting 2500 to 6200 RPM operation, this cam provides the valve event aggression necessary for performance builds without requiring upgraded valvetrain geometry or extensive head modifications.

The 0.541-inch lift specification represents a meaningful step up from stock LS camshaft profiles, directly translating to increased cylinder head breathing and fuel charge velocity. The 272/278-degree duration split—slightly asymmetrical with longer exhaust duration—improves scavenging efficiency and supports broader torque delivery across the operating range. The 112-degree LSA (lobe separation angle) is a moderate overlap window that balances street drivability with performance gains, keeping fuel economy and emissions reasonable while unlocking mid-range and upper-RPM power. Hydraulic roller design eliminates the complexity and cost of solid lifter conversion, maintaining OEM-compatible hydraulic valve adjustment and simplifying installation into factory LS block architecture.

This camshaft is suited for LS engine builders pursuing a power increase without stepping into exotic fuel requirements or extreme cylinder head porting. Common applications include naturally aspirated LS1, LS2, LS3, and truck-variant LS engines in performance street cars, weekend track vehicles, and street rods where improved throttle response and top-end horsepower are priorities. The RPM band indicates suitability for engines running conventional fuel systems and moderate boost levels, making it a practical choice for builders balancing performance gains against budget and reliability constraints.

COMP Cams is recognized for precision manufacturing and quality control in the aftermarket camshaft segment. This LS272PU-12 model is sold individually and requires proper installation by a qualified technician familiar with LS engine teardown, timing, and valve lash verification procedures. Pair this cam with matching lifters, pushrods, rocker arms, and a tuned fuel management system for optimal results.