For '70-'84 custom chassis with alternator-style primaryNatural crankcases and stock-looking silver powder-coated cylindersHas correct length sprocket shaft for '70-'84 primary and transmissionIncludes oil filter mount for generator locationAccepts '66-'84 exhaust systems'66-'84 intake ports with O-ring inletsS&S hydraulic valve train with roller rocker armsS&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 operationMade in the USA