The entry model to the Alfa Romeo Giulia coupe range was the GT 1300 Junior. It was introduced in 1965 as the replacement for the series 101 Giulia Sprint 1300, which was the final development of the Giulietta Sprint series.
The Alfa Romeo Giulia Coupe 1300 GT Junior was fitted with the 1300 (1290 cc) twin cam engine (74 mm bore x 75 mm stroke), twin carbs, as fitted to the Alfa Romeo Giulietta series cars, but revised for the 105 series with reduced port sizes and other modifications. The smaller engine was introduced in order to benefit from Italian tax laws based on engine size.
Together with the Giulia (Berlina) 1300 Ti, the Alfa Romeo Giulia Coupe 1300 GT Junior pioneered the use of ATE disk brakes as later fitted throughout the 105 series, replacing the Dunlop disks on earlier cars. The first few Alfa Romeo Giulia Coupe 1300 GT Junior lacked a brake servo, which was fitted as standard from 1967 onwards.
The performance was low-end compared to others in its model line, with a total of 90 bhp. Despite this, the 1300 Junior's top speed was 100 mph with a 0-60 in 12.6 seconds.