LS1/LS6 Xtreme RPM High Hyd. Roller Cam XR275HR

The LS1/LS6 Xtreme RPM High Hyd. Roller Cam XR275HR from COMP CAMS is purpose-built for serious LS-platform enthusiasts seeking maximum RPM capability and aggressive valve timing. This hydraulic roller cam is engineered for high-revving applications where conventional flat-tappet designs fall short, delivering the reliability and performance demanded by street machines, track cars, and forced-induction builds. Whether you're building a naturally aspirated screamer or preparing a turbocharged powerhouse, this cam provides the valve lift and duration needed to breathe at extreme engine speeds.

Hydraulic roller technology in the XR275HR eliminates the friction penalties of traditional designs while maintaining precise valve control across the entire RPM band. COMP CAMS' XR (Xtreme RPM) grind utilizes optimized lobe geometry and proven metallurgy to ensure consistent lift, duration, and lobe separation angle throughout thousands of engine cycles. The roller design self-adjusts for thermal expansion, eliminating tedious manual lash adjustment and reducing maintenance intervals. This cam is compatible with stock and aftermarket LS1/LS6 cylinder heads and works seamlessly with both carbureted and fuel-injected configurations, making it adaptable to virtually any modern LS swap scenario.

Serious builders and experienced mechanics benefit most from the XR275HR when targeting high-revving powerplants exceeding 6,500 RPM. Installation requires standard LS cam installation procedures—timing chain alignment, proper rocker arm preload verification, and valve-to-piston clearance confirmation. This cam pairs exceptionally well with high-flow cylinder heads, aggressive intake manifolds, and performance fuel systems. Verify your pushrod length, rocker arm geometry, and valvetrain components before installation to ensure optimal performance and longevity.