Pontiac GTO 389 Tri-Power

Pontiac GTO 389 Tri-Power

The Pontiac GTO is the car that started the muscle car revolution. In 1964, Pontiac's young chief engineer John Z. DeLorean and his team found a loophole in GM's corporate ban on intermediate-sized cars with engines over 330 cubic inches. Rather than making the GTO a separate model (which would require corporate approval), they listed it as an option package for the Tempest LeMans — the GTO option, RPO 382.

The name itself was audacious. 'Gran Turismo Omologato' — borrowed from Ferrari's legendary 250 GTO — was a declaration of intent. Purists were outraged. Car & Driver famously (and controversially) tested a GTO against a Ferrari 250 GTO and declared the Pontiac the winner, a stunt that generated enormous publicity.

The 1964 GTO combined the Tempest's intermediate A-body platform with Pontiac's full-size 389 cubic inch V8. The base engine was a single 4-barrel Carter AFB rated at 325 hp, but the Tri-Power option — three Rochester 2-barrel carburetors — bumped output to 348 hp. The result was stunning performance at an affordable price. At just $2,852, the GTO offered more performance per dollar than anything else on the road.

Pontiac had initially projected sales of 5,000 units. They sold 32,450 in 1964. The GTO proved that young buyers wanted affordable performance, and every other manufacturer scrambled to create their own muscle cars.

The 1965 model received stacked headlights and a slightly restyled body. The 1966 model got its own unique body (no longer a Tempest option but a separate model) with the iconic Coke-bottle profile. The 1967 model introduced the 400 cubic inch engine, replacing the 389.

The GTO was more than a car — it was a cultural phenomenon. It spawned the song 'Little GTO' by Ronnie & The Daytonas before it even went on sale, was featured on countless magazine covers, and defined what a muscle car was supposed to be: big engine, intermediate body, affordable price.