Late model aluminum cylinders cannot be accurately honed without using torque plates. Simulates stress conditions when boring or honing. Torque plates are drilled for multiple application use and can accommodate up to a 3.4375 - 4" bore with stock Evolution bolt pattern. Torque plates are made to fit on cylinders without removal of the ring dowels. 66-99 Big Twin with single cam only. Includes aftermarket and S&S motors. Made in USA. Evolution Cylinder Torque Plates
