The largest factory engine in the 1966 Mercury Comet Cyclone GT was the S-code 390 cubic inch V8, delivering 335 horsepower - Mercury's formidable entry in the muscle car wars.

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From Columbia University alumni built in San Francisco

Lena: Hey Miles, I was digging through some old car magazines at my uncle's garage last weekend and came across this gorgeous 1966 Mercury Cyclone GT. Those stacked headlights and that fiberglass hood with the twin scoops just screamed muscle car era!
Miles: Oh man, those '66 Cyclones are something special! You know, that was actually the year Mercury completely transformed the Comet from a compact to a proper intermediate-sized car. They stretched the wheelbase to 116 inches to compete with other mid-sized muscle cars.
Lena: Right, and didn't they pack some serious power under that hood? I remember reading something about a big block engine option.
Miles: Exactly! The Cyclone GT came standard with that 390 cubic inch V8 pushing 335 horsepower. It was Mercury's answer to the muscle car wars, and what's fascinating is how rare some of these models are today. The convertible GT with the four-speed manual? Only 539 were ever made!
Lena: That's incredible! No wonder they're so coveted by collectors. So what was the largest engine Mercury ever put in these beauties?
Miles: That's where it gets interesting. For the 1966 Comet Cyclone GT, that S-code 390 cubic inch V8 with 335 horsepower was as big as it got from the factory. Let's explore what made this powerplant so special for Mercury's muscle car contender...