Guess the year, make and model!!

This driveway shot captures a 1966 Pontiac GTO, the year the GTO graduated from an options package on the Tempest to a model of its own. Buyers who ticked the box for the 389 cubic-inch Tri-Power engine got 360 horsepower, helping make 1966 the GTO’s best sales year yet. See if you can spot the details that give away the year before reading on.

You’ve seen the stacked headlights and the coke-bottle curves before — maybe in a driveway, maybe in a movie, maybe on a poster on someone’s garage wall. The question is whether you can place the exact year without peeking at a badge. This particular car carries one of the most quietly debated nameplates in Detroit history: the year it stopped being an options package and became a legend in its own right. Get the year right and you’ll understand why buyers walked into Pontiac showrooms in record numbers that season.

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From Option Package to Icon

The GTO debuted in 1964 as a performance option on the Pontiac Tempest, but by 1966 it had graduated into a standalone model with its own distinctive coke-bottle styling, a mesh-screen grille, and stacked headlights. That shift mattered: it told buyers Pontiac was serious about building a dedicated muscle car rather than just dressing up a family sedan.

The Tri-Power Temptation

Order the 389 cubic-inch V8 with the Tri-Power option and a 1966 GTO buyer got 360 horsepower and 424 lb-ft of torque, fed through three two-barrel carburetors. It wasn’t cheap or common — only 19,045 cars were built with Tri-Power that year — but it turned an already quick car into one of the most sought-after configurations of the era.

A Sales Phenomenon

The formula worked. Pontiac moved nearly 97,000 GTOs in 1966, making it the best-selling muscle car in the country and cementing the nameplate’s reputation for good.

Spotting a 1966 from surrounding model years comes down to a few details: the stacked headlights, the mesh grille texture, and the absence of the later hood scoops that arrived in 1967 and 1968. Once you know what to look for, a GTO’s model year becomes almost as easy to read as its badge.

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