GM LS XFI Cam - XR275HR13

The COMP Cams GM LS XFI Cam XR275HR13 is a hydraulic roller camshaft engineered for General Motors LS-series engines running the XFI fuel injection platform. This camshaft delivers 0.566-inch intake lift and 0.576-inch exhaust lift, with intake duration of 275 degrees and exhaust duration of 287 degrees at 0.050-inch tappet rise. The 113-degree lobe separation angle balances street manners with responsive power delivery across the 1800 to 6800 RPM operating band, making it a versatile choice for street and light performance applications on LS-based powertrains.

The hydraulic roller design eliminates valve train noise and accommodates hydraulic lifter systems standard on most LS engines, reducing the complexity and cost of installation compared to solid roller conversion builds. The XFI profile is specifically optimized to work with sequential fuel injection systems, ensuring smooth idle quality and reliable cold-start performance while maintaining strong mid-range torque and top-end horsepower. The 113 LSA keeps overlap controlled, preserving vacuum for power-brake and emissions-control compatibility on street vehicles. Duration and lift specs are conservative enough to maintain stock-style drivability without demanding premium fuel or extensive tuning.

This camshaft is designed for builders upgrading stock or mildly modified LS engines—LS1, LS2, LS3, 5.3L truck blocks, and similar variants. It suits owners seeking noticeable performance gains without top-end RPM capability or radical overlap that sacrifices idle quality. Installation requires a timing chain, gasket set, and proper valve clearance verification. COMP Cams hydraulic roller profiles are recognized for consistent performance and longevity when properly installed in compatible LS configurations.