Bolt on kit, the largest cylinder bore possible without requiring machining of crankcases. Includes MLS (multi-layered steel) head gaskets and cam cover badge. S&S stroker 4.625" flywheel required and is sold separately. Takes 107"/114"/117" to 136" displacement. Original engine serial numbers are retained. Retains stock engine height. Made in the USA. Fits 17-24 107/114/117 M8. For Export Only.