P-93 Series EngineNatural crankcases and stock-looking silver powder-coated cylinders Has correct length sprocket shaft for 1970-up primary and transmission Includes oil filter mount at generator location Accepts 66-84 exhaust systems 66-84 intake ports with O-ring inlets S&S hydraulic valve train with roller rocker arms S&S billet timer and S&S super stock single-fire ignition system protects engine with a three-step break-in rev-limiter for the first 24-hours of operation Made in the U.S.A. For 1970-1984 custom chassis with alternator-style primary.