Ultra Pro Magnum XD Roller Rocker Arms, 7/16" Stud Dia, 1.7 Ratio CO1820-16

Suit Big Block Chevy

CO1820-16

1820-16

Built to outlast and outperform in accuracy and strength, the Ultra Pro Magnum XD Rocker Arms are engineered from durable 8650 steel and include a machined billet pushrod seat insert for a wide range of super accurate ratios. A unique and wide ratio range to fit almost any popular application from 1.5 to 1.7 in .5 increments for Chevy and 1.6 to 1.7 for various Ford applications is available. These XD rockers are fully rebuildable and boast precision-sorted needle bearings and hardened roller tips. And, they work with most diameter springs and retainers. The new XD design utilises advanced FEA and CAD design and development to improve strength, stiffness and MDI optimisation for drag and circle track applications. Machined billet pushrod seat insert for wide range of rocker ratios used in popular Chevy and Ford applications 8650 Steel construction outlasts and outperforms other rockers in accuracy and strength Precision-sorted needle bearings better distribute the load and reduce wear Engineered for use in circle track and drag race applications