The earlier armored car designs, such as the BA-27, were based on a truck chassis. Following the BA-27 project, the next projects were undertaken at the Izhorskiye Factory in Kolpino on the basis of newly imported Ford Model A automobiles, and their Soviet copies, the GAZ-A. The chassis for most armored cars of the 1930s were built by the KIM plant in Moscow and the Gorkiy plant in Nizhny Novgorod. The latter plant was originally known as the Nizhny Novgorod Automobile plant (NAZ), but was renamed as the Gorkiy Automobile Plant (GAZ) in the mid-1930s. These chassis were shipped to the armored car manufacturers (primarily the Izhorskiy and the smaller but longer established Vyksinskiy plant), where the armored bodies were mounted on the chassis and final assembly was undertaken. Prior to 1931, the imported Ford Timken chassis was used for some Soviet armored cars. While this chassis was available thereafter, the provision of series production technology to the USSR by Henry Ford in 1931-32 gave a major boost to Soviet armored car production. It provided readymade chassis for both light (Ford/GAZ-A and Ford/GAZ-AA-based) and heavy (GAZ-AAA-based) armored cars. ZiS was also later to provide 6×4 chassis for limited production heavy armored cars.