The XDP HD Exhaust Roller Rocker Arm XD766 is a heavy-duty, direct-fit replacement for Dodge 5.9L diesel engines, designed to maintain reliable valvetrain operation. Built from high-strength steel, this rocker arm features a forced oiling design that routes oil through the adjusting screw into the pushrod cup for improved lubrication and reduced wear. Maintains factory rocker ratio and is compatible with OEM-style cylinder heads. Features and Benefits: Exhaust OnlyRoller Tip DesignHeavy-Duty ConstructionTool Steel Adjusting ScrewDesigned For Use With OEM-Style Cylinder HeadsStock Rocker Ratio For Proper Valvetrain Geometry Details: