Only 357 Mercury Cougars were ever built with Ford’s legendary 427 side-oiler under the hood — and once emissions rules forced a switch to the 428 Cobra Jet in May 1968, that engine never appeared in a new Ford product again. The GT-E’s understated Cougar body hides one of the rarest big-block stories of the entire muscle car era. It’s proof that the wildest factory oddities don’t always wear the loudest badges.
Ford’s 427 side-oiler is one of the most legendary big-blocks of the entire muscle car era, and there’s a moment in 1968 when it landed under the hood of a car most people don’t even associate with big-block firepower. Mercury wrapped it in a Cougar body, called it the GT-E, and then built so few of them that most enthusiasts have never seen one in person. This wasn’t a badge-engineered Mustang with a bowtie swapped for a cat — it was the last new car Ford ever put a factory 427 into, full stop. Once you know that, a plain-looking Cougar in a driveway suddenly means something very different.
The Last Factory 427, Ever
When Ford built 427-powered GT-Es for the first part of the 1968 model year, nobody knew they were watching the end of an era. By May of 1968, emissions and cost pressures forced Ford to swap in the 428 Cobra Jet across the lineup, which means every 427-powered Cougar built before that changeover carries a genuine historical distinction: it’s the final production application of Ford’s legendary 427 side-oiler. That’s not muscle car marketing hyperbole — that’s a hard stop in Ford’s own engine history, and the GT-E happened to be standing there when it happened.
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Rarer Than Almost Anything With a Bowtie or a Pony on It
According to GT-E registry records, only 357 Cougars left the factory with the 427 under the hood, rated at 390 horsepower, out of a total GT-E run of 394 cars once you count the later 428 Cobra Jet cars. Compare that to production numbers on a Hemi ‘Cuda or a Boss 429 and the GT-E doesn’t just hold its own — it’s rarer than most of the cars that get all the auction-block attention. A luxury-leaning Cougar body wrapped around race-bred Ford muscle is exactly the kind of factory oddity that makes this hobby worth obsessing over.
Why This One Still Flies Under the Radar
Part of the reason the GT-E doesn’t get the respect it deserves is optics — the Cougar always positioned itself as the classier, more restrained alternative to the Mustang, so nobody expects a side-oiler 427 hiding under that hood. But that’s precisely what makes a surviving, numbers-matching GT-E 427 such a find today: it’s the rarest big-block Ford of its year, wearing a body most people wrote off as a boulevard cruiser. Anyone lucky enough to find a real one should consider it one of the great sleeper stories of 1968.
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Special ordered a 1970 Cougar XR-7 with a 428CJ, close ratio Nascar 4-speed, and 3.50 rear end. Engine package used the “shaker-hood scoop”, but I wanted a clean “sleeper” so I had it factory ordered with the standard hood. Gas lines in the ’70s with a 10mpg car…bad timing!