The GTA 1300 Junior (1968–1972) had an 1300 cc engine that was based on the 1600 engine but with a short stroke crankshaft. The GTA Junior in stradale form did not have many of the light weight features of the 1600 GTA, such as the plastic windows, magnesium engine components and alloy wheels. At start the engine produced 96 PS (71 kW; 95 hp) but was soon raised to 110 PS (81 kW; 110 hp). Autodelta prepared fuel injected racing cars had 165 PS (121 kW; 163 hp). 450 GTA Juniors were produced.