COMP Cams Rockers CB 1.8 7/16in Ultra Pro 1828-12

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 application. 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 utilizes advanced FEA and CAD design and development to improve strength, stiffness and MOI optimization for drag and circle track applications. COMP Cams Ultra Pro Magnum XD Roller Rocker Arms, 1.8 Ratio, 7/16" Stud Diameter for Big Block Chevrolet, Set of 12 For Big Block Chevrolet applications, 1.8 ratio, 7/16" stud; Machined billet pushrod seat insert; 8650 steel construction outlasts and outperforms other rockers in accuracy and strength; Ultra Pro Magnum XD Rocker Arm bodies are guaranteed against breakage for life; Fits, Fitments 1970 Chevrolet Chevelle Base 1970 Chevrolet Chevelle Concours 1970 Chevrolet Chevelle Concours Estate 1970 Chevrolet Chevelle Greenbrier 1970 Chevrolet Chevelle Malibu 1970 Chevrolet Chevelle Nomad 1970 Chevrolet Chevelle SS 1970 Chevrolet Corvette Base 1971 Chevrolet Chevelle Base 1971 Chevrolet Chevelle Concours 1971 Chevrolet Chevelle Concours Estate 1971 Chevrolet Chevelle Greenbrier 1971 Chevrolet Chevelle Malibu 1971 Chevrolet Chevelle Nomad 1971 Chevrolet Chevelle SS 1971 Chevrolet Corvette Base 1972 Chevrolet Brookwood Base 1972 Chevrolet Chevelle Base 1972 Chevrolet Chevelle Concours 1972 Chevrolet Chevelle Concours Estate 1972 Chevrolet Chevelle Greenbrier 1972 Chevrolet Chevelle Malibu 1972 Chevrolet Chevelle Nomad 1972 Chevrolet Chevelle SS 1972 Chevrolet Corvette Base 1973 Chevrolet Corvette Base 1973 Chevrolet Laguna Base 1973 Chevrolet Laguna Estate 1973 Chevrolet Malibu Base 1973 Chevrolet Malibu Estate 1974 Chevrolet Corvette Base 1974 Chevrolet Laguna Base 1974 Chevrolet Laguna Type S-3 1974 Chevrolet Malibu Base 1974 Chevrolet Malibu Classic 1974 Chevrolet Malibu Estate 1975 Chevrolet Laguna Base 1975 Chevrolet Laguna S3 1975 Chevrolet Malibu Classic