The Ferrari GTO (often referred to as Ferrari 288 GTO)(Type F114) is an exotic homologation of the Ferrari 308 GTB produced from 1984 to 1987 in Ferrari's Maranello factory, designated GT for Gran Turismo and O for Omologata (homologated in Italian).
The GTO was based on the rear mid-engine, rear wheel drive 308 GTB, which has a 2.9 L (2,927 cc) V8. The "288" refers to the GTO's 2.8 litre DOHC 4 valves per cylinder V8 engine as it used a de-bored by 1 mm (0.04 in) with IHI twin-turbochargers, Behr air-to-air intercoolers, Weber-Marelli fuel injection and a compression ratio of 7.6:1.
The 2.85 litre engine capacity was dictated by the FIA's requirement for a turbocharged engine's capacity to be multiplied by 1.4. This gave the GTO an equivalent engine capacity of 3,997 cc (4.0 L; 243.9 cu in), just under the Group B limit of 4.0 litres.