Pontiac Firebird Convertible 1968 vs. Plymouth Hemi Cuda 1971

A 1968 Pontiac Firebird convertible offered buyers a full menu of engines from a modest six-cylinder up to a 335-horsepower V8. A 1971 Plymouth Hemi ‘Cuda offered exactly one engine and only seven surviving convertibles. See how two completely different factory philosophies now translate into wildly different price tags at auction, ranging into the millions for the rarer of the two.

Put a 1968 Firebird convertible and a 1971 Hemi ‘Cuda side by side and you’re not just looking at two muscle cars from different ends of the same era — you’re looking at two completely different philosophies about what a factory performance car should be, separated by barely three years but worlds apart in execution. One offered buyers a sprawling menu of engine choices to fit almost any budget. The other offered exactly one engine, built for exactly one kind of buyer. Which approach actually produced the more desirable car today comes down to a set of numbers that might surprise anyone who hasn’t looked closely at both cars’ production records.

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The Firebird’s Buffet Of Engine Choices

Pontiac gave 1968 Firebird convertible buyers an unusually wide spread of engine options to choose from, starting with a modest 175-horsepower base inline-six for buyers who wanted the styling without a steep price tag. At the top of the range sat a 400-cubic-inch V8 producing 330 horsepower, or 335 horsepower with the Ram Air option added, giving performance-minded buyers a genuinely serious engine without forcing them into a completely different body style or trim level. That range meant a single Firebird convertible order sheet could produce cars with dramatically different personalities depending entirely on which engine box got checked.

A Chassis Built For Everyday Use

Underpinning every engine option was the same 108.1-inch wheelbase chassis, a platform tuned to work reasonably well whether the buyer had checked the base six-cylinder box or the top 400-cubic-inch V8. That kind of engineering flexibility was typical of the era’s pony car segment, where manufacturers needed a single chassis to competently handle everything from an economy-minded commuter build to a genuine street performance package, all wearing the same body panels and interior trim.

How Many Firebird Convertibles Actually Sold

Pontiac moved 107,112 Firebirds in total for the 1968 model year, and out of that broader total, 16,960 were convertibles — a healthy number that reflects just how strong open-top demand still was in the pony car segment during the late 1960s. That production volume puts the Firebird convertible in a very different rarity category than a car like the Hemi ‘Cuda, since collectors today have a meaningfully larger pool of surviving examples to choose from, spanning the full range of engine and trim combinations Pontiac offered that year.

The ‘Cuda’s Single, Uncompromising Engine

Plymouth took the opposite approach entirely with the 1971 Hemi ‘Cuda, offering exactly one engine: the 425-horsepower 426 Hemi V8, available with either a TorqueFlite automatic or a 4-speed manual transmission. There was no six-cylinder economy version and no mid-range V8 option sitting underneath it — buyers who wanted a Hemi ‘Cuda got the full, uncompromising performance package or they looked elsewhere in Plymouth’s lineup entirely. That single-minded approach stands in sharp contrast to the Firebird’s buffet-style engine lineup, reflecting two very different ideas about how to sell a performance car to the public.

A Production Number That’s Almost Hard To Believe

Plymouth built only 114 Hemi ‘Cudas for the entire 1971 model year, with roughly 107 of those built as hardtops, though sources vary somewhat on the exact split, and just 7 finished as convertibles. Compared against the Firebird’s 16,960 convertibles built in a single model year, the Hemi ‘Cuda convertible’s production number looks less like a rounding error and more like a statistical anomaly — a car so rare that most Mopar collectors will go their entire careers without ever seeing one of the seven in person.

What That Rarity Means At Auction

That gap in production numbers shows up directly in what these cars command today. Recent auction results for surviving Hemi ‘Cuda convertibles have landed between $3.3 million and $6.5 million, figures that place the car among the most valuable American production cars ever sold at public auction. A well-preserved 1968 Firebird convertible, by contrast, remains a genuinely attainable collector car for most enthusiasts, precisely because Pontiac built enough of them that supply can still reasonably meet demand even decades later.

Two Paths To The Same Collector Market

Both cars still draw serious interest from collectors today, just from very different directions. The Firebird convertible appeals to buyers who want genuine late-1960s pony car style and a range of engine choices to fit different budgets, while the Hemi ‘Cuda convertible appeals to buyers chasing the absolute pinnacle of Mopar rarity and performance, regardless of cost. Neither approach is inherently better than the other — they simply represent two different eras’ answers to the same basic question of how to build and sell a desirable performance convertible.

Why This Comparison Still Fascinates Collectors

Setting these two cars side by side highlights just how differently manufacturers approached performance convertibles in the years just before the muscle car era wound down under mounting insurance and emissions pressure. The Firebird represents the broadly accessible end of that spectrum, while the Hemi ‘Cuda represents the narrowest, most expensive extreme Detroit ever attempted with a factory-built convertible. That contrast is exactly why enthusiasts still enjoy comparing the two decades later — not because one car is simply better than the other, but because they capture two genuinely different visions of what a factory performance convertible could be during one of the most creative stretches in American automotive history.

What Ownership Looks Like For Each Car Today

Owning either car today comes with a very different set of realities. A Firebird convertible, with its wider surviving population and broader parts availability, remains a genuinely usable classic that owners can drive regularly and service without hunting down impossibly scarce components. A Hemi ‘Cuda convertible occupies the opposite end of that spectrum entirely — with only seven ever built, ownership is less about weekend driving and more about careful preservation, insurance, and safeguarding a piece of automotive history that can never be replaced if something goes wrong. That gap in everyday practicality is as much a part of the two cars’ contrasting stories as their production numbers or engine lineups.

Two Snapshots Of The Same Muscle Car Moment

Even with such different price tags and rarity levels, both cars capture the same broader moment in American performance history, when manufacturers were still willing to build genuinely aggressive convertibles despite rising insurance costs and the regulatory pressure building on the horizon. Looking at them together offers a fuller picture of that period than studying either car in isolation, showing both how accessible performance could be for the average buyer and how far a manufacturer was willing to go for the small handful of buyers chasing the absolute pinnacle of the segment.

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