The XDP HD High Boost Valve Spring Set XD767 is designed for Ford 6.7L Powerstroke engines to improve valve control under increased boost and lift. Featuring a conical design with increased seat pressure, these valve springs reduce valve float and maintain valvetrain stability. Sold as a complete set of 32, ideal for replacement during valvetrain service or performance upgrades. Features and Benefits: Complete SetDesigned To Support Elevated Boost Levels And RPMIncreased Spring Pressure To Help Reduce Valve FloatConical Valve Spring Design For Improved Valvetrain ControlSpecifications: 133 lbs at 1.333 inch installed height183 lbs at .965 inch (.368 inch valve lift)Maximum valve lift: .420 inch when installed at 1.333 Details: