Transform the 114" or the 117" oil-cooled M8 into 132", Adjustable pressure relief valve can be adjusted with unit installed in the engine, S&S valve springs feature high-performance conical single-wire spring design, Big bore cylinders are matched with cam/cam plate and oil pump, Magnet in cam chest to help prevent debris from entering oil pump, Independent scavenge sections for flywheel cavity and cam chest, Original engine serial numbers are retained, Passage plugs are removable for servicing, MLS (multi-layered steel) head gaskets, Debris screen in both scavenge pickups, Performance matched 550 cam, Works with stock crankcase, Retains stock engine height , Includes cam cover badge, Made in the USA