SBM Hydraulic Roller Cam 254HR-12

The COMP CAMS SBM Hydraulic Roller Cam 254HR-12 (part number 20-608-9) is a computer-controlled hydraulic roller camshaft engineered for small-block Mopar engines seeking aggressive idle quality and strong mid-range torque characteristics. This cam delivers 0.480-inch lift on both intake and exhaust with a 254-degree intake and 262-degree exhaust duration, providing a broad power band between 700 and 4800 RPM—ideal for street and mild performance applications that demand reliability without sacrificing responsiveness.

The 112-degree lobe separation angle (LSA) establishes the cam's fundamental operating envelope, controlling overlap and cylinder scavenging efficiency. Hydraulic roller design minimizes wear on the lobe and lifter interface compared to flat-tappet designs, translating to extended service intervals and reduced maintenance burden. The computer-controlled profile ensures consistent valve timing across the RPM range, eliminating the variability introduced by mechanical wear or poor synchronization. At 9.06 pounds, the finished casting is compatible with standard small-block Mopar timing components and does not require exotic installation tooling or special lifter systems.

This camshaft suits builders targeting 400–500 hp street engines where drivability, fuel economy, and cold-start characteristics matter as much as peak output. The moderate duration and lift keep cylinder head porting demands reasonable, allowing use of stock or mildly ported casting. Performance enthusiasts restoring or upgrading Mopar small-block platforms—including 273, 318, 340, and 360 engines—will find this profile balances daily usability with noticeable performance gains over original equipment. The hydraulic roller mechanism provides automatic lash compensation, eliminating manual valve train adjustment and reducing installation complexity.