S&S Big Bore Kit 128ci - M8 Oil CooledThe Big Bore Cylinder Kit is a precision engineered displacement upgrade designed for 114ci and 117ci oil cooled Milwaukee Eight engines. When used with the stock 4 1 2" stroke M Eight crankshaft, this kit increases displacement by enlarging the boredelivering noticeable gains in torque and horsepower while retaining excellent street reliability. Designed to work efficiently with stock cylinder heads, this kit offers strong performance improvements