The Alfa Romeo Giulia coupe 105 series featured the GT (Gran Turismo) model description, which was common to all models in one form or another. The various models in this range can be considered in two broad categories;
The first category were the various Gran Turismos (GT) and Gran Turismo Veloces (GTV), (veloce is Italian for “fast”). These were meant to be the most sporting cars in the Alfa Romeo range and sold very well to enthusiastic motorists around the world. The first model available was the Giulia Sprint GT (1963) which evolved into the Giulia Sprint GT Veloce (1965), the 1750 GTV (1968) and the 2000 GTV (1972–1976), with engines increasing in cubic capacity from 1570 cc (Giulia Sprint GT/GTV) through 1779 cc (1750 GTV) to 1962 cc (2000 GTV). A limited production (1000 units) convertible, the Giulia Sprint GTC, was based on the Giulia Sprint GT, modified by Touring of Milan, with only 1,000 produced from 1964 to 1966.
The second category was the GT Junior range, which featured engines with smaller cubic capacities. GT Juniors sold in great numbers to people who wanted a sporting, stylish car that handled well, but either did not require the maximum in engine power, or could not afford the taxation on larger engine capacities in some markets – most notably, Alfa Romeo’s home Italian market. Junior models began with the first GT 1300 Junior in 1966. The GT 1300 Junior continued until 1976 with the 1290 cc engine and various modifications incorporating features from the evolution of the GT’s and GTV’s. From 1972 a GT 1600 Junior model was also available, with the 1570 cc engine.
The 1300 Junior and 1600 Junior also became available with a very different, aerodynamic two-seater coupé body designed by Ercole Spada for Zagato of Milan. These models were the GT 1300 Junior Zagato and GT 1600 Junior Zagato.
Both categories were used to derive GTA (“Allegerita”, or “lightened”) models, which were specifically intended for competition homologation in their respective engine size classes. The GTA’s featured extensive modifications for racing, so they were priced much higher than the standard models and sold in much smaller numbers. Practically all GTA’s made were used in competition, where they had a long and successful history in various classes and category. These models included the Giulia Sprint GTA, GTA 1300 Junior, and GTAm (a much evolved version of the GTA built by Autodelta).
Although not commonly thought of as a 105 Series coupé variant, the Alfa Romeo Montreal used a strengthened and slightly modified 105 series floorpan and suspension.