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Designed as part of the 128CI and 131CI Screamin’ Eagle Milwaukee-Eight Stage IV Performance Kit, this Second Generation of Extreme Ported Cylinder Heads has been meticulously designed to optimize air/fuel flow and velocity. Improving on the First Generation of CNC-Ported Milwaukee-Eight Cylinder Heads, the Screamin' Eagle team refined the intake and exhaust ports to maximize the flow of high-velocity air through the 1mm larger valves of 128CI and 131CI engines and fully machined the combustion chamber to optimize combustion efficiency....read more
Replacement cylinder heads for Twin-Cooled '17-later Milwaukee-Eight models equipped with 128 or 131CI Stage IV kits. All models require ECM calibration with Screamin’ Eagle Pro Street Tuner or dealership installed Screamin’ Eagle calibration for proper installation. See Dealer for details.