The GTO was introduced in 1964 as a performance option for the Tempest in convertible, coupe and hardtop form. Standard equipment included 389 V8 which developed over 325 hp. Moreover, the package included a four-barrel carburetor, dual exhaust and premium tires. Available as options were 4-speed automatic or manual gearbox, limited slip differential, tachometer, seat belts, power steering and power brakes.
The hottest version of the GTO included a tri-power carburetion setup. Three vacuum powered Rochester carburetors increased the power to an astonishing 348 horsepower. In 1967 GM made a corporate ban on multi-carburetor engines. This put an end to the legendary tri-power GTO.
In total over 32 000 GTOs were sold in its first year. Largely helping sales was the low $300 price for the Tempest GTO. Quickly, the GTO became a major success, defining and motivating an upcoming market of muscle cars.
Pushrod Operated OHV, 2 Valves per Cyl
6375 cc / 389.0 in³
103.12 mm / 4.06 in
95.2 mm / 3.75 in
242.4 kw / 325 bhp @ 4800 rpm
50.98 bhp per litre
210.77 bhp per tonne
580.29 nm / 428 ft lbs @ 3200 rpm
body / frame
f brake size
mm / in
r brake size
mm / in
Double A-Arms w/Coil Springs, Tube Shocks, Anti-Roll Bar
Live Axle w/Coil Springs, Lower Radius Arms, Tube Shicks