Buick Built Only 7,850 of These 1964 Wildcat Convertibles – And Hid a 360-HP Nailhead Under the Hood

Buick’s full-size 1964 Wildcat looked like a country-club cruiser, but the option sheet hid a 360-horsepower dual-quad 425 and a four-speed stick behind that formal grille. Only 7,850 convertibles were built that year, and a rare survivor with the full performance package still turns heads six decades later.

Buick never called it a muscle car. In 1964, the Wildcat wore a formal grille, acres of side trim, and a name borrowed from a string of 1950s dream cars — the kind of details that told buyers they were looking at a boulevard cruiser, not a stoplight fighter. Pop the hood on the right one, though, and that impression falls apart fast: twin four-barrel carburetors sitting on a 425-cubic-inch Nailhead V8 rated at 360 horsepower, bolted to a four-speed manual you had to row yourself. Buick built just 7,850 Wildcat convertibles that year, and only a slice of those left the factory with the dual-quad engine and stick-shift combination that made this the quickest full-size Buick money could buy.

A Full-Size Buick Built to Outrun Its Own Reputation

The Wildcat name started life on a trio of Harley Earl-designed show cars in the 1950s before Buick attached it to a production model in 1962, initially as a sportier trim level of the Invicta, the full-size Buick it would eventually replace outright. For 1963, the Wildcat broke out into its own series entirely, slotted between the workaday LeSabre and the flagship Electra 225. It rode a 123-inch wheelbase — three inches shorter than the Electra — and could be ordered with bucket seats, a center console, and a tachometer, options that pushed it closer to a personal car than a family sedan even before anyone touched the engine bay.

By 1964, Buick offered the Wildcat with two versions of its Nailhead V8. The standard engine was a 401-cubic-inch unit nicknamed the “Wildcat 445” for its 445 lb-ft of torque, rated at 325 horsepower. Buyers who checked the right option box could step up to a 425-cubic-inch “Wildcat 465,” good for 340 horsepower with a single four-barrel carburetor — or 360 horsepower with the factory dual-quad setup Buick called the “Super Wildcat.” That year’s lineup spanned four body styles: 20,144 four-door sedans, 33,358 two-door hardtops, 22,893 sport coupes, and just 7,850 convertibles, for a model-year total of 84,245 cars.

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1964 is also visually distinct from any other Wildcat year. While every other Buick that year carried the brand’s signature row of chrome VentiPorts on the front fenders, the Wildcat dropped them in favor of vertical chrome hash marks below the beltline — a one-year-only styling cue that makes a 1964 model identifiable at a glance even to people who’ve never opened the hood.

The Narrow Window for 360 Horsepower and a Stick

1964 sits inside a tight overlap in Buick’s option sheet. The 425 dual-quad engine was only offered from 1964 through 1966, and the four-speed manual transmission was only available from 1963 through 1965 — which means 1964 and 1965 were the only two model years a buyer could pair Buick’s biggest Nailhead with a clutch pedal on the Wildcat’s short wheelbase. In fact, 1964 was the only year the Wildcat could be ordered on its shortest 123-inch wheelbase with both a 360-plus horsepower engine and a four-speed manual at the same time. Stack the dual carburetors, the stick shift, and the drop-top body style together, and you’re looking at a genuinely rare build, not just a rare trim level.

The Nailhead itself had been evolving since 1953, when it debuted at 322 cubic inches and 188 horsepower — the engine family that gave Buick its first true V8. Over the following decade, displacement grew by roughly a third and output nearly doubled, and the 425 represented the design’s final and largest form before Buick replaced it with an all-new 430-cubic-inch big-block for 1967. Under the finned aluminum valve covers embossed with the Buick logo, the dual-quad 425 in a 1964 Wildcat was as close as the Nailhead ever got to a factory street-racing engine.

What a Barn-Fresh Survivor Reveals Up Close

A recently resurfaced example — dark paint, red interior, top down — spends over 40 minutes on camera walking through exactly what made these cars tick, and it’s a reminder of how accessible engine bays were in this era: every plug, hose, and carburetor sits in plain view, nothing buried under plastic covers. The dual carburetors atop the 425 are unmistakable once you know what you’re looking at, and the console-mounted tachometer and four-speed shifter make it obvious this particular car wasn’t ordered off the base equipment sheet.

Owners who grew up around one of these cars still talk about the impression it left — learning to drive in a parent’s Wildcat, taking road trips with a trunk that swallowed luggage for a family of five, watching the car turn heads decades before it became a collector piece. That kind of everyday-driver history is part of what makes surviving examples with intact original mechanicals so valuable to today’s Buick specialists.

Why the Dual-Quad Wildcat Still Sneaks Up on People

The Wildcat’s whole appeal was that it didn’t look the part. Buick wrapped a genuinely quick drivetrain in vinyl roofs, chrome side trim, and full-size proportions that read as luxury first and performance second — years before the Gran Sport name gave Buick a more overt muscle-car identity, first on the Skylark in 1965 and then as a one-year-only Wildcat GS package in 1966. A 360-horsepower Wildcat could embarrass cars that looked far more aggressive doing it, which is exactly the kind of sleeper reputation that keeps these cars interesting to collectors who already own the obvious muscle-car icons.

Because Buick sold nearly seven times as many hardtops and sedans as convertibles that year, a dual-quad, four-speed drop-top Wildcat was never going to be common — and six decades of attrition have only tightened that supply further. Track down a matching-numbers example today, and you’re not just buying a rare Buick — you’re buying one of only two model years the Nailhead’s biggest form could ever be ordered with a clutch pedal at all. For a car that spent its whole life being mistaken for a country-club cruiser, that’s a quiet kind of vindication.