SBC Ultra Pro Magnum XD R/A's - 1.5 7/16

The SBC Ultra Pro Magnum XD R/A's - 1.5 7/16 from COMP CAMS represents precision roller rocker arm technology engineered for high-performance engine builds demanding aggressive valve lift and duration. These solid body rockers deliver the repeatability and durability required in racing, off-road, and full-throttle tactical vehicle platforms where conventional stamped rockers fall short. Built for users who refuse compromise on valve train integrity, the SBC Ultra Pro Magnum XD series addresses the structural demands of extreme duty cycles where reliability under stress is non-negotiable.

The 1.5 7/16 ratio designation indicates the rocker arm's mechanical advantage multiplier, translating cam lobe lift into valve lift with precision geometry optimized for XD (extra-duty) applications. COMP CAMS' Ultra Pro construction utilizes hardened steel roller tips that minimize friction and wear while maintaining exact valve actuation geometry across thousands of cycles. The roller design reduces parasitic losses, allowing more of your engine's potential to reach the valve train without binding, chattering, or deflection—critical in systems where timing accuracy directly impacts performance margins. At 9.3 lbs total weight, these rockers provide robust structural integrity without excessive mass penalty, maintaining the balance essential for responsive throttle control in tactical mobility platforms.

Small block Chevrolet (SBC) engine builders and off-road specialists benefit most from this rocker arm set, particularly those running solid roller camshafts with aggressive lobe profiles exceeding stock lift specifications. Installation requires proper rocker stud, guideplates, and valvetrain geometry confirmation—misalignment will cause accelerated wear and potential valve train failure. The 1.5 7/16 ratio suits applications pairing high-lift cams (typically .500" or greater) with cylinder heads requiring geometric precision; verify your specific camshaft lift and head port alignment before purchase. These rockers demand quality oil circulation and regular valve train inspection in extreme-duty service to maintain tolerance margins and extend service intervals.