Mercury Cougar 1970 Boss 302 Eliminator

Ford built the Boss 302 to win Trans-Am races, not to sell Mercurys — which makes its brief appearance in the 1970 Cougar Eliminator one of the odder footnotes in muscle car history. Only 469 were built, and today they quietly rank among the most valuable Cougars ever produced.

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Ford built the Boss 302 for one reason that had nothing to do with street driving: homologating the Mustang for SCCA Trans-Am racing. Handing that same high-revving engine to a Mercury Cougar seems almost like an afterthought, yet that’s exactly what happened once the Eliminator package replaced the GT as Mercury’s performance flagship in April 1969. By 1970, the 351 Cleveland had become the Cougar’s standard V8, which pushed the specialized Boss 302 into a strange corner of the lineup — available, but only if a buyer specifically asked for the Eliminator, and only in numbers small enough that most Cougar owners never even knew it existed. How rare did it actually get?

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An Engine Built for the Track, Bolted Into a Boulevard Cruiser

The Boss 302 in the Eliminator was the same high-winding, solid-lifter small block found in the Boss 302 Mustang, factory-rated at 290 horsepower at 5,800 rpm — a rev range most other muscle car engines of the period never approached. The Eliminator package wrapped that engine in unmistakable visual cues: a blacked-out grille, a body-colored hood scoop, unique side stripes, and high-back bucket seats, backed by a genuine competition suspension with heavy-duty shocks, springs, and a rear stabilizer bar rather than the softer setup most Cougar buyers actually ordered.

Why This Engine Option Barely Registers in Cougar History

Only 469 Mercury Cougars in 1970 were built with the Boss 302, a fraction of that year’s total production and a number that puts this car well ahead of most factory muscle in terms of scarcity. Collector demand today tells its own story: Cobra Jet-equipped Eliminators have sold for as much as $220,000, while the rarer Boss versions haven’t been far behind, with a Competition Blue example bringing $195,000 at auction — proof that this overlooked engine option quietly became one of the most valuable combinations Mercury ever built.

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