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Pontiac did not offer a GTO convertible for 1972, which left one option for buyers who wanted open-air performance: the LeMans Sport Convertible, orderable with any of the three GTO-spec engines including the 455 HO at 300 net horsepower. Pontiac built roughly 3,400 to 3,500 of them at a $3,225 base price, and 1972 was the last year the body existed. Read on to find out why the market still undervalues them.

This 1970 Dodge Charger R/T pairs the 426 Hemi with a rare EB3 Light Blue Metallic and black vinyl top combination — one of just 56 Hemi Chargers built with an automatic transmission that year. Read on to find out why so few buyers said yes to the Hemi’s steep price tag, and how the engine paid off on Dodge’s most successful NASCAR season yet.

Mercury built the 1969 Cougar Eliminator to look like a street brawler, then sold most of them with engines other than the one this car carries. Only 260 buyers out of 2,250 checked the box for the 390 four-barrel FE big block, making it the quiet outlier in an already uncommon package. Here is why the underdog engine deserves a second look.

Plymouth built exactly five 1971 ‘Cuda 440 Six Barrel convertibles with a four-speed. Not five hundred, five. That number is the result of a perfect storm: a top-tier engine option, the rarest body style, the least popular transmission choice, and a model year in which the entire muscle car market collapsed underneath it. Read on for how a car this specific ever got built and why 1971 is the most consequential year in E-body history.

A 30-year barn find just resurfaced wearing one of the rarest factory engine combinations Ford ever built — a triple-carbureted 406 big block that fewer than 124 full-size Mercurys ever received from the factory. Paired with a factory 4-speed and a special-order 4.11 rear axle, this Monterey is a genuine sleeper hiding inside a plain-looking family sedan. Read on to find out what made this engine option so rare, and what a numbers-matching survivor like this is worth today.

Chevrolet built the 1966 Corvette’s 427 big-block for one reason: Shelby’s Cobra was embarrassing American racing, and something had to answer it. Only 5,258 of the 27,720 Corvettes built that year came with the range-topping L72 427/425, a solid-lifter monster that could reportedly outrun its own factory horsepower rating. That scarcity is why numbers-matching L72 cars still command serious money at auction. Few options ever turned a sports car into a legend this fast.


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