Pontiac GTO was first released in 1964 in three body styles: 2-door convertible, 2-door hardtop and 2-door coupe. Initially, the GTO package was an option for the Pontiac Tempest and it included GTO badges, a 6-litre V8 power plant which developed 325bhp, 3-speed manual transmission with a floor-mounted gearstick, stiffer suspension, wider wheels with redline tyres and the iconic bonnet scoop. As an option, the engine could be fitted with more powerful three two-barrel carburettors which raised the power output to 348bhp. In 1965, the Tempest was restyled to have vertically stacked headlights, new bonnet scoop and several mechanical upgrades including revised cylinder heads and intake manifolds which raised the power to 335bhp for the base engine and 360hp for the optional three two-barrel carbs configuration. 1966 was very important for the GTO as it was the year in which it became a separate Pontiac model. Now separate model went through another update which included adding more curvature to the body, restyling rear tail lights and a little increase in the wheelbase dimensions. The production of the first generation of the GTO ended in 1967. The last-year model was updated mechanically and visually. The louver-covered rear taillights were replaced with 4 lights on each side of the vehicle, the split grille was updated to share a single chrome trim and the engine received a larger cylinder increasing the displacement to 6.5 litres. The new motor was available in three models: 265bhp ‘economy’, 335bhp ‘standard’ and 360bhp ‘high output’.