BBF Ultra Pro Magnum XD R/A's - 1.73 7/16

The COMP CAMS BBF Ultra Pro Magnum XD rocker arms with 1.73 ratio and 7/16-inch stud mount represent a high-performance valvetrain solution engineered for big block Ford, Cleveland, and modified engine platforms. This complete set of 16 rocker arms delivers the precision geometry and durability demanded by serious engine builders and performance enthusiasts who require consistent, repeatable valve actuation across full RPM ranges.

The 1.73 mechanical advantage ratio amplifies cam lift to optimize valve opening timing and duration, a critical variable in maximizing cylinder head flow characteristics and combustion efficiency. Ultra Pro Magnum XD construction combines full roller design with chromoly steel, reducing friction losses at the cam lobe interface while providing the structural strength required to handle elevated spring pressures and aggressive cam profiles. The 7/16-inch stud mount configuration ensures secure fastening and compatibility with common big block Ford and Cleveland head designs. Full roller technology eliminates the wear patterns associated with traditional flat-tappet designs, extending valvetrain service life and maintaining precision rocker geometry over extended use.

This 16-piece set is intended for builders completing ground-up engine builds on big block Ford, Cleveland, or heavily modified variants where OEM valvetrain components cannot meet performance requirements. Applications range from street performance builds to racing engines where valvetrain reliability and consistent lift multiplication directly impact power output and engine longevity. The chromoly construction and roller design are particularly valuable in high-RPM applications and forced-induction setups where valvetrain loads increase dramatically.

COMP CAMS maintains a reputation for precision engineering and quality control in the valvetrain components segment. The Ultra Pro Magnum XD line represents a mid-range offering designed to balance performance gains with cost considerations, making it a popular choice among builders who require reliability beyond stock but do not necessarily pursue top-tier racing specifications. Proper installation with appropriate valve spring rates and rocker stud specifications is essential for optimal performance and longevity.