The latest development in Rocker arm Technology from COMP Cams are Ultra Pro Magnumâ„¢ XD Rocker Arms built for 1/2" Studs to increase valve train stiffness and stability. Designed to be used in conjunction with the COMP Cams Hi-Tech 1/2" Rocker Stud Kit, the latest versions of COMP Cams Ultra Pro Magnum XD are built to utilize 1/2" Studs to stabilize SBC valve trains. Ultra Pro Magnumâ„¢ XD Rockers are built to outlast and outperform in accuracy and strength, while maintaining all the benefits of the Ultra Pro Magnumâ„¢ version. The XD Rockers are engineered from durable 8650 Steel and include a machined billet Pushrod seat insert for a super-accurate ratio. The Rockers also boast precision-sorted needle bearings and hardened Roller tips. And since they now feature the added benefit of accepting 1/2" Studs, they are a great choice for anyone looking for more stiffness with Stud mount Rockers. These new Ultra Pro Magnumâ„¢ XD Rocker Arms will provide the ultimate in valve train stability for maximum valve motion both at the track and on the street.1/2" Studs provide a stiffer valve train to achieve maximum valve motion in SBC enginesDeliver increased strength and rigidity while reducing the moment of inertia and optimizing dynamic balanceUltra Pro Magnumâ„¢ XD Rockers feature a machined billet Pushrod seat insert for a super-accurate ratio

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