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IMPORTANT NOTICE: Images are for representation purpose only. Actual product size and configuration available may differ from those shown. For specific size and model, please refer to the manufacturer website using MPN (manufacturer part number shown in description).-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. - For Small Block chevrolet applications, 1.5 ratio, 3/8 inch 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 - COMP Cams Rocker CS 1.5 3/8in Ultra Pro - 036584231998