SBF Ultra Pro Magnum XD R/A's - 1.7 7/16

The COMP CAMS SBF Ultra Pro Magnum XD R/A's rocker arms are engineered for serious small block Ford performance applications where precise valve timing and durability under high-RPM conditions are non-negotiable. This set of 16 full roller rocker arms features a 1.7:1 ratio and 7/16-inch stud mount configuration, delivering the mechanical advantage and reliability required in street, strip, and competition engines where maximum power extraction matters.

Constructed from chromoly steel, these rocker arms provide the strength needed to handle elevated valve spring pressures while the full roller design minimizes friction across the valve tip, reducing parasitic drag and promoting consistent valve actuation across the RPM band. The 1.7 ratio multiplies cam lobe lift by 1.7 times, increasing valve lift and duration effect—a critical variable for camshaft performance tuning. The 7/16-inch stud mount secures directly to the cylinder head with no additional hardware, simplifying installation and ensuring repeatable geometry from build to build.

Small block Ford engine builders—whether running a classic 289, 302, or modern 5.0L crate platform—depend on Ultra Pro Magnum XD rocker arms when transitioning to aggressive cam profiles or targeting higher valve spring rates that demand robust arm construction. This set replaces both intake and exhaust sides, simplifying purchasing and ensuring consistent mechanical advantage across all eight cylinder positions. Builders working with aftermarket cylinder heads, performance camshafts, or supercharger applications recognize COMP CAMS rocker arms as a foundational reliability component that pairs seamlessly with upgraded valve train packages.