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Only one 1969 Trans Am ever left Pontiac’s factory with a race-bred Ram Air V under its hood, built purely to test a car nobody planned to sell. From that single engineering mule to the 335-horsepower 455 HO of 1971 and the Super Duty that closed out the era in 1974, these are the rarest Trans Am engine programs collectors still track down decades later.
Buick spent two decades disguising some of the fastest cars General Motors ever built as luxury sedans. The 1970 GSX Stage 1 hid a 510 lb-ft big block under a car built for church parking lots, and the 1987 turbocharged GNX blew past that year’s Corvette in the quarter-mile. Here’s how a brand nobody feared became one of muscle car history’s biggest sleepers.
A 1968 Chevy Nova has traded its small-block V8 for the turbocharged straight-six out of a Toyota Supra, and the numbers make the swap impossible to dismiss: over 860 wheel horsepower, more than double what any factory Nova SS ever produced. Here’s how a 2JZ ended up under a muscle car’s hood, and whether the swap actually holds up as a daily-drivable build.
A 1972 Dodge Challenger arrived during the weakest years Detroit’s muscle cars ever saw, topping out at 240 factory horsepower with no Hemi in sight. Car Craft’s revived build series just swapped in Mopar’s 807-horsepower Hellcrate Redeye, the same crate engine Dodge sells over the counter. The bigger challenge wasn’t the engine itself, but getting a car never designed for fuel injection to survive it.
An Oldsmobile outsold the Mustang and the Camaro combined for years running in the mid-1970s, and its 87-year-old designer is finally telling the story. Len Casillo shaped the Cutlass Supreme’s formal Colonnade lines — the same lines that turned a mid-size Oldsmobile into America’s best-selling car two years running.
AMC had a fastback on the auto-show floor before the Mustang even existed, then handed the idea to a new CEO who scrapped it for something bigger and slower to sell. The result moved barely 17,000 units in three years, yet one six-cylinder survivor from suburban Chicago shows exactly why the story still matters — and its owner bought it in 2011 for a reason that has nothing to do with horsepower.
Hidden in Phoenix, Arizona is a private garage holding a real 1970 Plymouth Superbird, a Boss 429 Mustang, and a Viper from every generation ever built. Its owner did not set out to build a museum — he set out to buy back the cars of his own past, starting with the Plymouth Road Runner he first drove as a teenager. Hagerty’s Larry Chen got a rare look inside.
Dan Hallisey brought his numbers-matching 1971 Plymouth GTX onto Jay Leno’s Garage — then handed his passenger seat to the high school auto shop teacher who taught him everything he knows about engines. The 440-powered GTX, one of the last built before Plymouth retired the nameplate for 1972, still has enough torque to catch a first-timer off guard. It’s a rare episode where the teacher, not the car, ends up stealing the show.
A 1969 Camaro SS that looks bone-stock is hiding a 502-horsepower GM Performance crate engine, a Tremec six-speed, and a full Detroit Speed Pro-Touring chassis underneath. Carburetors are gone in favor of modern EFI, and the suspension borrows hardware straight from the C6 Corvette — without changing a single body panel. It’s proof a big-block Camaro can be brought fully into 2026 without losing what made it a legend in 1969.
A $900 wreck of a 2008 Mustang GT got turned into a head-turner for under $2,500 total, and viewers say the real story isn’t the build — it’s the car underneath it. The S197-generation GT’s 300-horsepower V8 and retro styling are still cheap today, but longtime owners and collector-car analysts both say that won’t last much longer.