Production was split between the Alfa Romeo plant in Arese and Carrozzeria Bertone's plants in Caselle and Grugliasco outside Turin. Alfa Romeo produced the chassis and engine and mechanicals and sent the chassis to Caselle where Bertone fitted the body. After body fitment, the car was sent to Grugliasco to be degreased, partly zinc coated, manually spray painted and have the interior fitted. Finally, the car was returned to Arese to have the engine and mechanicals installed. It is worth noting that because of this production method, there is not necessarily any correspondence between chassis number, engine number and production date.