Harley-Davidson Milwaukee 8 Screamin Eagle Stage IV CNC Ported Cylinder Heads for 117 engines. These heads are for stage 4 Water Cooled engines. These are used but in very good condition, no issues. Clean up and bolt on your compatible bike. Individual head Part numbers are 16500520 and 16500526. Kit Harley Part # is 16500527. Replacement cylinder heads for’17-later CVO Twin-Cooled (water cooled) Touring models or twin cooled models equipped with Screamin’ Eagle Milwaukee-Eight 117ci Stage IV Kits. Designed in conjunction with the system-matched components of the Screamin? Eagle Milwaukee-Eight Stage IV Performance Kit, these CNC-Ported Cylinder Heads have been meticulously machined to optimize air/fuel flow and velocity. Starting with a unique Screamin’ Eagle cylinder head casting, the Screamin? Eagle team has dedicated countless hours of computer simulation and flow bench testing to maximize the flow through the intake and exhaust ports. Factory equipped with high performance valve springs that remain stable with high lift cams and in and high RPM operation. Ports are meticulously machined on our five axis CNC machine to increase the velocity of the intake charge and to maximize exhaust scavenging. When combined with a larger bore throttle body, Cylinder Heads provide improved efficiency of cylinder filling, leading to more explosive power and increased rear wheel torque when compared to stock. Replacement cylinder heads for’17-later CVO Twin-Cooled Touring models equipped with Screamin Eagle Milwaukee-Eight Stage IV Kits.