S&S Big Bore Kit 128ci - M8 Oil Cooled 18 mm and 12 mm

18 mm and 12 mm O2 bungs welded into the primaries

see required 701518 front fender adapter kit

Combines a GelCore™ interior with Ultra-Foam that creates a perfect balance of rigidity and user compliance

Designed to meet stock dimensions

Proper tuning is mandatory after installation

S&S Big Bore Kit 128ci - M8 Oil Cooled 18 mm and 12 mmThe 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