What does the GT stand for on a Ford mustang?

The 1967 model year would see the first of the Mustang's many major redesigns with the installation of big-block V8 engines in mind. The high-performance 289 option now took a supporting role on the option sheet behind a massive 335 hp (250 kW) 390 in³ (6.4 L) engine direct from the Thunderbird, which was equipped with a four-barrel carburetor. Stock 390/4speed equipped Mustangs of the day were recording ¼ mile times of mid 13's, with trap speeds of over 105 mph. A drag racer for the street took a stand during the middle of the 1968 model year, as the 428 in³ (7.0 L) Cobra Jet engine officially rated at 335 hp (250 kW), but in reality producing well in excess of 400 hp. The 1968 Mustang fastback gained pop culture status when it was used to great effect in the crime thriller Bullitt. Lt. Frank Bullitt drove a modified Mustang GT-390 fastback, played by legendary actor Steve McQueen, chasing two hitman in a Dodge Charger in the film's famous car chase through the streets of San Francisco.