Chevy V8 396-454 Big Block, 1.73 Ratio 7/16 Stud, Set of 16 These XD rockers are fully re-buildable and boast precision-sorted needle bearings and hardened roller tips. The new XD design utilizes advanced FEA and CAD design and development to improve strength, stiffness and MOI optimization for drag and circle track applications. 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. High Strength Rocker Arms For Drag Racing COMP Cams Ultra Pro Magnum XD Rockers With 1.73 Ratio For Chevrolet Big COMP Cams Ultra Pro Magnum XD Rockers 1.73 Ratio COMP Cams Rocker Arms 1823-1 The next design evolution of the Hi-Tech Stainless Steel Roller Rocker Arms are 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... For Big Block Chevrolet applications , 1., 73 inches ratio; 7/16 inches stud The next design evolution of the Hi-Tech stainless steel roller rocker arms are built to outlast and outperform in accuracy and strength. COMP Cams Rocker Arm CB 1.73 7/16in Ultra Pro - Blow-By Racing 8650 steel construction outlasts and outperforms other rockers in accuracy and strength
