The four-barrel version of the 389 with 335 horsepower was the top choice, making its way to nearly 55K cars. The Tri-Power was the second most popular powertrain, as over 20,500 GTO buyers wanted ...

Car enthusiasts now have an exciting opportunity to win a piece of automotive history: a meticulously rotisserie-restored 1965 Pontiac GTO convertible, complete with the iconic Tri-Power V-8 engine.

Read more: How To Clean Your Car's Engine Bay: A Step-By-Step Guide Although the 389 and the tri-power setup shown above made the GTO a legend, the engine and tri-power option had been in Pontiac ...

The GTO was slowly but surely ... with the four-barrel version of the 389 V8 rated at 335 horsepower. However, 20,547 customers wanted the Tri-Power engine and paid $115 more when they ordered ...