Quick Facts

This summary establishes the specifications common to the run while separating the two engine families and the principal body phases.

The 6267 designation is more useful than the broad Series 62 label when inspecting a car. Series 62 also included coupes and sedans, and exterior trim can be moved between related Cadillac bodies far more easily than a Fisher body plate can be legitimately reconciled with the shell.

Why the Series 62 Convertible Matters

The 1948 Series 62 introduced the small fin-shaped rear-fender extensions inspired by the twin-boom Lockheed P-38 Lightning. Cadillac styling chief Harley Earl supported the direction, while Frank Hershey is closely associated with the design work. These were not yet the towering fins of the late 1950s. They were compact, integrated forms that gave the rear fenders a vertical termination and created a Cadillac styling signature copied across the American industry.

One year later, the 1949 model received Cadillac's short-stroke, high-compression 331 OHV V8. The new engine produced more power than the larger 346 flathead while occupying less space and weighing less. Its breathing, combustion chamber and oversquare dimensions also provided much greater development potential, demonstrated by Cadillac-powered competition cars at Le Mans and by the engine's long production evolution.

The convertible concentrated both changes in Cadillac's most visible regular-production open model. It was expensive, conspicuous and mechanically representative of the standard line rather than a separate low-volume engineering exercise. The 1953 Eldorado then took the same general formula into a more specialized, hand-finished direction with a cut-down body, wraparound windshield and metal cover over the lowered top.

Historical Context and Development

From Wartime Production to Civilian Cadillacs

Cadillac resumed civilian car production after building tanks, tank engines and other military equipment during World War II. The 1946 and 1947 automobiles consequently relied on tooling and structures derived from the shortened 1942 model year. Demand greatly exceeded supply, so engineering refinement and production recovery took precedence over an immediate clean-sheet body.

The Series 62 sat below the long-wheelbase Series 75 and used a more modern, lower body than the formal Fleetwood limousine. Its chief domestic rivals included the Lincoln Continental and Cosmopolitan, Chrysler New Yorker and Imperial, and Packard Super and Custom convertibles. Cadillac's combination of an automatic transmission, powerful V8 and General Motors production resources proved commercially formidable.

The 1948 Body and 1949 Engine

The all-new 1948 body lowered the visual mass, shortened the wheelbase from the previous Series 62 dimension and used a more integrated envelope-fender shape. A broad egg-crate grille, restrained brightwork and the first tailfins distinguished it immediately. On a convertible, the low fabric roof and long rear deck made those fins particularly legible.

The 1949 engine was not developed to satisfy a racing homologation rule, and the Series 62 convertible itself had no factory competition mandate. Nevertheless, the new V8's compact dimensions and power attracted racers. Briggs Cunningham entered Cadillac-powered cars at the 1950 24 Hours of Le Mans, including the near-standard Series 61 coupe nicknamed Petit Pataud and the aerodynamic special known as Le Monstre. That competition record belongs to the engine and Cadillac chassis family, not specifically to the production convertible.

The 1950–1953 Redesign

Cadillac redesigned the Series 62 again for 1950 with a longer-looking, lower body on the established 126-inch wheelbase. The grille became broader, the hood lower and the rear quarters more substantial. Annual revisions added heavier bumper forms and increasing brightwork without obscuring the basic proportions.

Power accessories became a larger part of the ownership experience. Power windows and the electro-hydraulic convertible top were already important features, while power steering appeared for 1952 and power-assisted brakes followed for 1953. Cadillac also adopted a 12-volt electrical system for 1953, a significant distinction when inspecting wiring, instruments, starting equipment and accessories.

Engine and Drivetrain

The 346 L-Head V8

The 1946–1948 engine displaced 346 cubic inches from a 3.50-inch bore and 4.50-inch stroke. Its valves sat in the cylinder block beside the cylinders, giving it the familiar L-head or flathead designation. A downdraft two-barrel carburetor fed the cast-iron V8, and factory output was rated at 150 hp.

The long stroke and conservative valve arrangement favored low-speed torque and smoothness rather than high engine speed. Pressure lubrication, liquid cooling and conventional breaker-point ignition were thoroughly understood by Cadillac service departments, but correct cooling-system condition remains essential in a heavy convertible. Restricted block passages, an aged radiator or incorrect ignition timing can make a sound engine appear troublesome.

The 331 OHV V8

Cadillac's 1949 V8 used a 3.8125-inch bore and 3.625-inch stroke for 331 cubic inches. Overhead valves operated through lifters, pushrods and shaft-mounted rocker arms. The compact combustion chambers allowed higher compression and better gas flow than the 346, producing 160 hp in its first season despite the smaller displacement.

Output remained 160 hp through 1951, rose to 190 hp for 1952 with four-barrel carburetion and reached 210 hp for 1953. Carburetor make and calibration can depend on year and application, so a Carter or Rochester unit should be checked against the applicable Cadillac parts book rather than judged by brand alone. The same discipline applies to distributors, intake manifolds and air cleaners, all of which have often been exchanged during decades of service.

Manual and Hydra-Matic Transmissions

The column-shifted three-speed manual used a dry single-plate clutch and conventional synchromesh gearbox. The four-speed Hydra-Matic used a fluid coupling, multiple planetary gearsets and automatically controlled shifts. Unlike a later torque-converter automatic, an early Hydra-Matic has a positive, busy shift pattern and can deliver a noticeable engagement when its bands, throttle linkage and engine idle are correctly adjusted.

Hydra-Matic became standard on the Series 62 for 1950. A fire at GM's Livonia Hydra-Matic plant in August 1953 interrupted supply, and some late 1953 Cadillacs were built with Buick's twin-turbine Dynaflow. A surviving 1953 Dynaflow car therefore requires production documentation and the correct installation details before anyone dismisses the transmission as a later swap.

The table separates the two core engine designs and the documented annual output changes. Cadillac's horsepower figures from this period are factory ratings and should not be compared directly with later SAE net figures.

Cadillac used a hypoid rear axle, with ratio dependent on model year and transmission. Axle gearing, speedometer drive and transmission specification should be considered together during restoration. Installing a later center section may make highway use easier, but it also changes engine speed, shift behavior and originality.

Chassis, Suspension and Braking

These Cadillacs used a separate steel frame under a Fisher-built body. The convertible required substantial sill, floor and cowl reinforcement because it lacked a fixed steel roof. Structural rust or poorly repaired collision damage consequently affects door fit, windshield alignment and top operation more severely than on a closed Series 62.

Independent front suspension used coil springs and unequal-length control arms, while the live rear axle rode on semi-elliptic leaf springs. The arrangement prioritized wheel travel and isolation on the broken concrete and secondary roads of the period. Hydraulic drum brakes served all four wheels, with power assistance available in 1953.

Steering was by a conventional steering box rather than rack and pinion. Manual steering demands effort at parking speeds, especially with incorrect modern tires, excessive caster or a dry linkage. Cadillac's 1952 power-steering option materially reduces low-speed effort, but its pump, hoses, control valve and steering gear must remain free from leaks and improper adjustment.

The following table identifies the chassis changes that matter most when comparing prospective cars or ordering restoration parts.

Wheel and tire specifications must be matched to the individual year. Radial tires can improve directional security, but size, sidewall height and steering clearance matter. An oversized radial on a manual-steering car can increase parking effort and overload wheel covers visually, even when it clears the body.

Driving Experience and Road Manners

A properly sorted 346-powered car moves away with a deep, restrained exhaust note and strong low-speed pull. Throttle response is deliberate rather than sharp, and the long-stroke engine rarely rewards high revs. The manual transmission has long column-shift travel, while Hydra-Matic keeps the engine working through closely spaced ratios and feels more alert than its fluid coupling might suggest.

The 331 changes the character substantially. It gathers speed with less effort, responds more cleanly above normal town speeds and makes the 1949–1953 cars better suited to sustained touring. A 1952 or 1953 four-barrel engine adds a stronger upper range, though kickdown linkage and carburetor secondary operation must be correct before judging performance.

Manual steering is heavy during parking but becomes calm and accurate once moving. The large wheel provides leverage, and the car responds best to measured inputs rather than quick corrections. Body roll is visible, yet good dampers, sound control-arm bushings and correctly arched rear springs keep it progressive.

The convertible structure can exhibit more cowl movement than a coupe or sedan, but pronounced shaking usually points to weak body mounts, deteriorated floors, loose front-end hardware or past structural repairs. Drum brakes provide adequate road-speed stopping when linings, cylinders and drums are correct. Repeated hard stops reveal heat and adjustment limitations that drivers of modern disc-brake cars must anticipate.

Identification and Originality

Body Style 6267 and Fisher Data

A genuine regular-production Series 62 convertible should correspond to Cadillac's style 67 convertible coupe designation, normally encountered as 6267 within the model and body-number system. The precise presentation changes by year, and later Fisher tags may add prefixes or suffixes. Buyers should compare the tag format with an unaltered same-year car, Cadillac parts literature and the relevant shop manual rather than applying one decoding chart to all eight model years.

The Fisher body plate records style, body sequence, trim and paint information in year-specific formats. Inspect the plate, its fasteners and the sheet metal around it for disturbance. A correct tag does not by itself prove that the surrounding body, frame and drivetrain began life together.

Serial and Engine Numbers

Cadillac's serial-number and engine-number practices predate the standardized 17-character VIN. Depending on model year, ownership records and service literature may refer to an engine or chassis serial number, so the number on a title must be physically located and compared with factory documentation before purchase. Do not assume that a modern replacement title using a body number reflects Cadillac's original identification practice.

Matching numbers should be treated in period context. An original-type engine with a number consistent with the car and its surviving paperwork is preferable, but Cadillac did not use the later muscle-car practice of stamping a full modern VIN on every major component. Casting dates, assembly features, carburetor tags, distributor numbers and transmission type help establish whether the mechanical package is chronologically credible.

Trim, Paint and Hydraulic Equipment

Grilles, parking lamps, hood ornaments, scripts, wheel covers and bumper details changed nearly every year. These parts are frequently interchanged because adjacent-year Cadillac components can appear similar at first glance. Photographs in dated factory sales literature are useful, but a parts book is better for confirming whether a casting or molding belongs to the exact style and year.

Paint and upholstery should be checked against the codes on the body plate and year-specific Cadillac color and trim references. Leather grain, pleat width, carpet binding, top material and the shape of the rear window all affect authenticity. Modern metallic paint with coarse flake rarely resembles the subtler metallic finishes used in the early 1950s.

The power top, windows and seat may use a combined electro-hydraulic system, depending on year and equipment. Restorers sometimes replace troublesome hydraulic windows with concealed electric mechanisms. Such conversions may improve convenience, but visible switches, incorrect regulators and abandoned fluid lines reduce originality and can complicate later repair.

Variant and Trim Breakdown

The regular Series 62 convertible retained the style 67 identity throughout the period, but body engineering and trim divide the run into clear groups. The 1953 Eldorado is included because Cadillac introduced it as a special Series 62 convertible rather than as an unrelated chassis.

The Eldorado's 532-unit production is well documented. It should not be recreated by adding wire wheels, an Eldorado script or a parade boot to an ordinary 6267. Its body structure, windshield treatment, beltline, top stowage and trim make a genuine car readily distinguishable under close inspection.

Performance and Dimensional Specifications

Period acceleration figures for the exact Series 62 convertible are not consistently available across all eight years, and magazine tests often involved lighter coupes or sedans. The table therefore uses repeatable factory specifications rather than transferring road-test numbers from a different body style.

Published weight figures often identify shipping weight rather than curb weight, and equipment such as hydraulic windows, radios, heaters, spare wheels and transmission choice changes the result. The convertible is consistently heavier than an equivalent coupe because of its reinforced body and top mechanism, but a single weight figure should not be applied to the entire 1946–1953 run.

Compared With Related Cadillacs

Series 61

The Series 61 generally provided a less elaborate and, in some years, shorter or lighter route into Cadillac ownership. It shared major engines with the Series 62 but lacked some of the latter's trim and standard equipment. There was no direct Series 61 equivalent to every Series 62 convertible configuration, so a rebodied or misidentified car should be checked by style number rather than exterior ornament.

Series 60 Special and Series 75

The Fleetwood-bodied Series 60 Special emphasized formal four-door design and distinctive interior appointments. The Series 75 used a much longer chassis for sedans and limousines. Neither is mechanically interchangeable with a Series 62 convertible merely because engines, instruments or trim pieces appear related.

1941–1942 Predecessors

The 1946–1947 cars retain much of the proportion and engineering established before civilian production stopped. Buyers who prefer separate front-fender forms, heavier upright trim and the 346 flathead often compare them with 1941 and 1942 Cadillacs. Scarcity of model-specific postwar brightwork can make the apparently newer car no easier to restore.

1948, 1949 and the First-Tailfin Choice

The 1948 and 1949 convertibles look closely related, but their engines make them substantially different restoration propositions. The 1948 is the first-tailfin Cadillac with the final-year flathead. The 1949 combines essentially the same body theme with the first OHV V8, which usually gives it stronger collector interest and noticeably better road performance.

1953 Series 62 Versus Eldorado

A standard 1953 Series 62 convertible has a conventional folding top profile and production body structure. The Eldorado's lowered beltline, wraparound windshield and metal top cover change both its appearance and its construction. Mechanical output alone does not distinguish the two, since both used the 210 hp 331 V8.

Ownership and Restoration Notes

Engine and Cooling Work

The 346 is durable but less familiar to general engine shops than a later overhead-valve Cadillac V8. Blocks require careful inspection for cracks, corrosion and previous freezing damage. Valve work, correct bearing clearances and a clean cooling system are more valuable than cosmetic detailing on an engine that will tour in warm weather.

The 331 has good specialist support, but early heads, rocker assemblies, manifolds and accessory drives should remain with the appropriate year. Worn rocker shafts can reduce oil control and valvetrain accuracy. Cooling passages, water pumps, harmonic balancers and distributor advance mechanisms deserve attention during a complete rebuild.

Hydra-Matic Service

Early Hydra-Matics are robust when properly rebuilt and adjusted, but they are not well served by shops familiar only with later three-speed automatics. Correct band adjustment, throttle linkage geometry, front and rear pump condition, seals and fluid-coupling integrity all influence shift quality. A transmission that flares, slips or engages violently can add significant specialist cost.

Body and Structural Corrosion

Inspect rocker structures, body mounts, floor braces, front floors, rear wheelhouses, trunk floor and the lower edges of doors and quarter panels. Water entering around the top or windshield can remain trapped beneath carpet and trim. On a convertible, rust in the inner sill is structural, even when the outer rocker looks presentable.

Door gaps should remain reasonably consistent with the top raised and lowered. A body that changes shape on a lift may have weak sills, missing braces or improper body shims. Correcting the paint before restoring the structure almost guarantees duplicated expense.

Trim and Hydraulic Systems

Mechanical service parts are generally easier to source than exact one-year grille pieces, die-cast ornaments, moldings, window frames and interior hardware. Rechroming pitted zinc castings can consume more labor than rebuilding the engine. Missing convertible-only components should be priced before purchase, not after disassembly.

Hydraulic cylinders, hoses and pumps can be rebuilt or reproduced, but leaks damage carpets, door trim and painted panels. A complete system should be tested under load, including every window and the seat where equipped. Slow movement may indicate low voltage or weak grounds as readily as a hydraulic fault, particularly on six-volt cars.

Buyer and Inspection Points

A convincing inspection begins with identity and structure, then moves through the expensive convertible-specific equipment. Fresh paint and a running engine cannot compensate for a mismatched body or a weakened sill assembly.

A pre-purchase inspection should include a cold start, a long enough drive to reach full temperature and operation of every powered accessory. The best candidate is not necessarily the shiniest car. Complete trim, sound structure, credible identification and functioning hydraulic systems often save more money than a recently rebuilt but undocumented engine.

Collector and Market Relevance

Open Cadillacs carry stronger collector demand than equivalent four-door sedans because fewer survived, restoration costs are higher and the body displays period styling with the roof lowered. Within this run, the 1948 attracts first-tailfin buyers, while the 1949 combines that body with the first OHV V8. The 1953 Eldorado sits apart because of its 532-unit production, specialized body and role as the first Eldorado.

Collectors reward original body tags, documented serial identity, correct engines and complete year-specific trim. Factory colors and interiors matter, but a carefully documented older restoration can be more convincing than a fresh car finished in a popular but incorrect combination. Manual-transmission cars are unusual, although rarity alone does not guarantee preference over a correctly operating Hydra-Matic.

There is no meaningful racing premium attached to a standard Series 62 convertible. The motorsport association comes from Cadillac's 331 engine and related 1950 Le Mans effort, not from a convertible competition program. Representing a road car as a competition derivative misunderstands the model's history.

Cultural Relevance

The 1948 tailfin altered the visual vocabulary of the American automobile. Cadillac developed the theme gradually over the following decade, and competitors adopted their own versions. On the 1948 and 1949 convertible, the first fins remain small enough to reveal their aircraft-inspired origin without dominating the entire body.

The Series 62 convertible also became closely associated with postwar American public life. Open Cadillacs appeared in parades, publicity photographs, entertainment and ceremonial use because their rear seats, broad bodies and low top lines displayed occupants clearly. That visibility has also encouraged decades of color changes, interior substitutions and superficial Eldorado-style modifications.

Cadillac-LaSalle club activity and specialist suppliers support preservation, technical research and touring. These cars are not primarily hot-rod platforms, although the early OHV Cadillac V8 was enormously influential among postwar racers and custom builders. A complete, correctly restored 6267 now tells that engineering story more clearly than another modified example.

Frequently Asked Questions

What engine did the 1946–1953 Cadillac Series 62 Convertible use?

The 1946, 1947 and 1948 cars used Cadillac's 346-cubic-inch L-head V8 rated at 150 hp. Cadillac introduced the 331-cubic-inch OHV V8 for 1949 at 160 hp, retained that rating through 1951, raised it to 190 hp for 1952 and 210 hp for 1953.

What does Cadillac body style 6267 mean?

Within Cadillac and Fisher body identification, 62 denotes the Series 62 family and 67 denotes the convertible coupe body style. The complete tag presentation can include year-related prefixes or suffixes, so identification must follow the factory literature for the specific model year.

Which year was the first tailfin Cadillac convertible?

The 1948 Cadillac Series 62 introduced Cadillac's first production tailfins. The visually related 1949 model retained the theme but replaced the 346 flathead with the new 331 OHV V8.

How can a 1953 Series 62 convertible be distinguished from an Eldorado?

The 1953 Eldorado has a specialized lowered body, wraparound windshield, distinctive beltline treatment, metal cover over the lowered top and model-specific trim. Wire wheels and Eldorado scripts alone do not convert a standard 6267 into one of the 532 factory-built Eldorados.

Did any 1953 Cadillac Series 62 Convertibles have Dynaflow?

Yes. After the August 1953 fire at GM's Hydra-Matic plant interrupted transmission supply, Cadillac installed Buick Dynaflow transmissions in some late-production cars. Documentation and correct factory installation details are necessary because later transmission swaps also exist.

What are the most serious restoration problems?

Structural corrosion in the inner sills, floors and body mounts is the largest concern. Missing convertible top hardware, damaged hydraulic systems, incomplete year-specific trim, cooling-system corrosion and an incorrectly rebuilt Hydra-Matic can also produce costs disproportionate to a car's cosmetic appearance.

Are parts available for a postwar Cadillac Series 62 convertible?

Routine engine, brake, suspension and hydraulic service parts have specialist support, and many components can be rebuilt. Exact grille castings, convertible window frames, top bows, interior hardware and one-year trim pieces are much harder to source, making completeness a major buying criterion.

Collector Takeaway

The strongest 1946–1953 Series 62 convertible is the car whose identity, structure and mechanical specification agree. A 1948 should be valued for the first tailfin body and final flathead year, a 1949 for joining that shape to Cadillac's first OHV V8, and a 1953 for the mature 210 hp drivetrain and its relationship to the first Eldorado. Treating all eight years as interchangeable erases the developments that make them worth studying.

Cadillac changed its convertible from a 1942-derived, 346-powered luxury car into a lower, faster and more technically ambitious 331-powered automobile within four model years. Few postwar model runs show a comparable transformation so clearly in one body style. Buy the most complete and structurally honest 6267 available, preserve its year-specific details, and let the hardware explain how quickly Cadillac entered the 1950s.