SBC Xtreme Roller Cam XR274R-10

The COMP Cams SBC Xtreme Roller Cam XR274R-10 is a mechanical roller camshaft engineered for small block Chevrolet engines seeking high-RPM performance and aggressive valve timing. This single-pattern cam delivers 0.564-inch intake lift and 0.570-inch exhaust lift across a 274-degree intake and 280-degree exhaust duration window, with a 110-degree lobe separation angle that balances street responsiveness and track capability. The roller design minimizes friction and wear compared to flat-tappet profiles, allowing sustained operation from 2,200 to 6,200 RPM with reliable valve train dynamics.

The XR274R-10's specifications reflect Xtreme Energy series tuning for mid-range torque and top-end power delivery. The 110 LSA opening produces moderate overlap, which maintains idle stability while supporting efficient cylinder charging at elevated speeds. Mechanical roller followers eliminate hydraulic lash compensation, reducing complexity and enabling tighter valve clearance control—a requirement for serious small block builds where precision matters. The lift and duration combination suits fuel-injected and carbureted platforms equally, making this cam adaptable across various SBC configurations from bolt-on performance to full street/strip applications.

This camshaft is engineered for builders and enthusiasts who prioritize mechanical reliability and straightforward installation. Small block Chevrolet owners upgrading from stock profiles will experience noticeably improved cylinder breathing and power output in the mid-to-high RPM band. The Xtreme Roller Cam XR274R-10 is sold individually, allowing matched sets to be ordered for complete valve train specification. Compatible with small block Chevy blocks and matching valvetrain components, this is a core upgrade for anyone developing a responsive, durable performance engine.