Dodge Dart 1964 GT Convertible 225 Slant Six

While Pontiac was inventing the muscle car with the 1964 GTO, Dodge was building the opposite: a Dart GT convertible with a 225 Slant Six, a pushbutton automatic, and fuel economy nobody advertised. It was not fast, and it was never meant to be. Read on for why the Slant Six Dart may have been the smarter buy in 1964 and why these cars are quietly becoming collectible on their own terms.

In 1964, a few hundred miles from where Pontiac was quietly launching the car that would define the next decade, Dodge was building something almost aggressively unfashionable. The Dart GT convertible could be ordered with a V8, and a fair number of buyers did exactly that. This one instead carries the engine nobody puts on a poster: a 225-cubic-inch Slant Six, tilted over at an angle, breathing through a single one-barrel carburetor, and connected to an automatic transmission you operated by pushing buttons on the dashboard. It sounds like a compromise from every angle. Sixty years later, the argument for it is much stronger than it looks.

The Wrong Engine at Exactly the Right Time

The 225 was the larger of Chrysler’s two Slant Six engines, an extra-cost option over the 170 in 1964, and it produced 145 horsepower at 4,000 rpm with 215 lb-ft of torque from an 8.4:1 compression ratio. Those numbers put the Dart GT convertible at roughly 15 seconds to 60 mph with a top speed near 100 mph, which nobody would have described as quick even in 1964. What the engine delivered instead was 16 to 17 miles per gallon at a time when a V8 intermediate struggled to manage twelve, plus the ability to run happily on regular fuel for as long as the owner cared to keep it.

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Why Chrysler Tilted the Engine Thirty Degrees

The engine’s defining feature was its 30-degree tilt, which was not a styling exercise. Canting the block over let Chrysler use a much longer intake manifold with generously curved runners, improving cylinder filling in a way an upright inline six could not match in the same underhood space. It also lowered the hood line and moved accessories to more serviceable positions. The result was an engine known throughout the industry as the Leaning Tower of Power, with a seven-main-bearing bottom end and a forged crankshaft that made it famously difficult to kill even under sustained neglect.

The Reason So Many Slant Six Cars Are Still Here

Durability, not speed, is what earned the Slant Six its reputation. Owners routinely reported well past 200,000 miles on original bottom ends in an era when 100,000 was considered a full life, and the engine stayed in Chrysler production in various displacements into the 1980s. That longevity is why so many surviving early A-bodies are six-cylinder cars: they were cheap enough to be kept as daily transportation long after the V8 versions had been crashed, raced, or parted out. The engine that made these cars unglamorous when new is a large part of the reason any of them are still here.

The Last Year of the Pushbutton Automatic

This particular Dart also happens to sit at the end of one of Chrysler’s most distinctive engineering habits. 1964 was the final model year in which buyers could order the pushbutton-controlled TorqueFlite automatic, a row of buttons mounted to the left of the instrument cluster that selected gears with no lever anywhere in the cabin. Chrysler dropped the arrangement for 1965 in favor of a conventional column or console shifter, partly for standardization and partly because federal safety thinking of the period favored familiar controls. Any 1964 Chrysler product with those buttons is operating a system that existed for barely a decade.

Dodge’s Golden Anniversary Model Year

Model year context matters here too. 1964 was Dodge’s Golden Anniversary, marking fifty years since the Dodge Brothers built their first car, and the division leaned on the milestone in its advertising throughout the year. The Dart itself was in the middle of the 1963 to 1966 A-body generation, riding a 111-inch wheelbase that gave it five more inches than the Plymouth Valiant it shared engineering with. That extra length went into rear seat room, which is a large part of why the Dart outsold the Valiant and became the volume car in Chrysler’s compact lineup.

What the GT Package Added Over a Base Dart

The GT designation was the top of the Dart range, and it bought appearance and interior upgrades rather than performance hardware. Bucket seats, a padded instrument panel, brighter exterior trim, full wheel covers, and specific badging separated it from the Dart 270 and base models. On this car the factory look has been sharpened with rally-style wheels wrapped in white-letter tires and a replaced convertible top over a black vinyl interior, which is exactly the kind of light, tasteful updating that suits a six-cylinder cruiser far better than an engine swap would.

The A-Body That Would Later Terrify Everyone

It is worth remembering what this same platform would become. Within a few years the A-body would host the 340 Dart GTS, the Dart Swinger 340, and eventually the Hemi-powered Super Stock cars that made the nameplate genuinely feared at drag strips. The 1964 car sits before all of that, which means it represents the Dart as originally conceived: an economy compact with just enough style to be sold as something more. Buyers today who want the shape without the price of a documented GTS have found that these earlier cars offer most of the presence for a fraction of the money.

Ownership Without the Anxiety

That gap is the whole practical argument. A Slant Six Dart GT convertible asks very little of its owner, runs on regular fuel, rarely overheats, sits on one of the best-supported platforms in the classic Mopar aftermarket, and can be maintained with hand tools in a home garage. Parts for the engine remain cheap and plentiful because Chrysler built the thing for three decades. There is no numbers-matching anxiety, no fear of a broken rare part, and no insurance conversation that ends badly, which together describe a very different ownership experience than a documented big-block car.

The Case for the Unfashionable Choice

None of that makes the car a substitute for a GTO, and it was never trying to be. What it offers instead is the shape, the chrome, the bucket seats, and the open top of an early-1960s American convertible, delivered by a drivetrain that will still be running when the fashionable choices are in pieces on a garage floor. It will lose every stoplight contest it enters, which stops mattering about ten minutes into a Sunday morning with the top down. Sixty years of hindsight has been kind to whoever walked past the V8 badge in 1964. Share your thoughts in the comments below.

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