1940–1942 Cadillac Series 62 Convertible Coupe: 346-Cubic-Inch L-Head V8

Cadillac built the Series 62 Convertible Coupe from 1940 through the curtailed 1942 model year, powering every example with its 346-cubic-inch L-head V8. Output rose from 135 horsepower in 1940 to 150 horsepower for 1941, when Cadillac also made the four-speed Hydra-Matic automatic transmission available alongside the standard three-speed manual.

The open two-door belonged to the newly introduced Series 62 family, initially riding a 129-inch wheelbase before moving to a 126-inch chassis for 1941 and 1942. Its Fisher-built body combined full-width seating, a folding fabric roof, and Cadillac trim with the lower, wider proportions that transformed the marque's styling immediately before American civilian automobile production stopped in 1942.

Best known for combining Cadillac's durable 346 V8 with elegant open Fisher coachwork, the Series 62 Convertible Coupe also became one of the earliest luxury convertibles available with a fully automatic transmission.

Quick Facts

The principal year-to-year distinctions concern wheelbase, engine output, body-style numbering, styling, and transmission availability. These details provide a useful starting point when assessing a car, title, body tag, or restoration.

The 6267 and 6267D numbers identify the body style rather than a separate chassis series. A genuine car should present a coherent combination of model-year serial information, Fisher body data, engine number, styling details, and wheelbase.

Why It Matters

Cadillac introduced the Series 62 for 1940 as part of a substantial consolidation of its model range. The Convertible Coupe placed the division's proven V8 and hydraulic brakes beneath modern Fisher bodywork, bringing Cadillac engineering to an open car less formal than a Fleetwood-bodied convertible sedan or the long-wheelbase Series 75.

The decisive mechanical change arrived for 1941. Cadillac adopted a shorter 126-inch wheelbase, raised V8 output to 150 horsepower, and offered Hydra-Matic, the transmission developed by General Motors and introduced by Oldsmobile for 1940. Hydra-Matic used a fluid coupling and four forward ratios, not a torque converter, but it eliminated the clutch pedal and shifted automatically under normal driving.

The 1942 model has another historical distinction. Civilian automobile manufacture ended shortly after the United States entered the Second World War, making every 1942 Cadillac part of a shortened production run. That circumstance, together with its heavier grille treatment and model-specific details, gives a correctly restored 1942 Convertible Coupe particular collector appeal.

Historical Context and Development

Cadillac entered 1940 with an all-V8 passenger-car range and a reputation built as much on standardized precision manufacture as on formal coachwork. The Series 62 replaced older naming and body conventions with a model that could share General Motors body architecture while retaining Cadillac engines, chassis equipment, instruments, trim, and finish.

Styling moved rapidly during these three years. The 1940 car retained separate visual elements from the late 1930s, including a tall grille and strongly defined front fenders, but its headlights were integrated into the fender line. For 1941, the hood became lower and broader, the horizontal grille spread across the nose, and the windshield, beltline, and fenders formed a more unified shape. The 1942 front end used a more massive grille pattern and fuller ornamentation before wartime restrictions halted civilian development.

The principal American competitors came from Packard, Lincoln, and Chrysler's Imperial range. Packard offered open cars with straight-eight power, while Lincoln relied on its V12. Cadillac's advantage was not racing homologation or competition success. It was the combination of a high-volume V8, independent front suspension, hydraulic braking, and, from 1941, an automatic transmission that could be ordered in a full-size luxury convertible.

The Series 62 was conceived for road use rather than motorsport, and no factory competition version or homologation derivative existed. Its engineering reflected fast American touring: abundant low-speed torque, high gearing, compliant springing, and controls designed for long distances rather than circuit work.

Engine and Drivetrain

The Cadillac 346 was a 90-degree side-valve V8 with a cast-iron block and cylinder heads. Its 3.5-inch bore and 4.5-inch stroke produced 346 cubic inches, or approximately 5.7 litres. The long stroke and conservative operating speed favored torque and smoothness over high-rpm breathing.

A centrally mounted downdraft carburetor supplied the engine, with output depending on model year and specification. Conventional coil-and-distributor ignition fired the eight cylinders, while pressure lubrication, a belt-driven water pump, fan, and radiator handled sustained road operation. The side-valve layout simplified the cylinder heads but left exhaust heat concentrated around passages in the block, making clean water jackets and a sound cooling system essential during restoration.

Manual cars used a single dry-plate clutch and a column-shifted three-speed gearbox with synchromesh on the upper ratios. The optional Hydra-Matic employed a fluid coupling, planetary gearsets, and hydraulically controlled shifts through four forward speeds. Power reached the rear axle through an open propeller shaft and conventional differential.

The documented core specifications show why a restorer must distinguish the 135-horsepower 1940 installation from the higher-output 1941 and 1942 form.

Factory literature emphasized horsepower rather than a modern torque curve or redline, so unsupported torque and engine-speed figures should not be used to authenticate a car. Carburetor, distributor, generator, starter, and transmission casting details are more useful when checked against a dated parts book and the individual car's production sequence.

Chassis, Suspension, and Braking

The Convertible Coupe used separate body-and-frame construction. Its Fisher body was reinforced to recover some of the torsional rigidity lost with the fixed roof, although an open pre-war body still depends heavily on sound sills, floor structure, body mounts, and frame alignment.

Cadillac's independent front suspension used coil springs, while the live rear axle was located by longitudinal semi-elliptic leaf springs. Four-wheel hydraulic drum brakes were well established Cadillac equipment by this period. The steering remained unassisted, and substantial wheel diameter helped provide the leverage needed at parking speeds.

The chassis specifications below distinguish the longer 1940 platform from the lower, wider 1941 and 1942 design.

The shorter 1941 chassis did not turn the Series 62 into a small car. It remained a broad, heavy convertible tuned around straight-line stability, generous suspension travel, and the poor surfaces common to contemporary American roads.

Driving Experience and Handling Dynamics

A correctly set up 346 V8 should start without drama, settle into a subdued idle, and pull from low engine speed without needing aggressive throttle. The long stroke and modest rev range encourage early upshifts. Mechanical noise increases before useful acceleration does, so the engine feels best when driven on its low-speed torque rather than extended in each gear.

The manual gearbox requires a deliberate hand at the column, especially until the oil is warm. Synchromesh does not excuse hurried shifts, and first gear is primarily for moving the car from rest. Hydra-Matic changes the experience substantially: engagement is more abrupt than in a later torque-converter automatic, and a healthy unit makes distinct shifts as its hydraulic controls select four forward ratios.

Steering effort is considerable when stationary but eases as the car moves. Initial response is measured, body roll is evident, and the narrow cross-ply tires relinquish grip progressively. The independent front suspension keeps wheel movement from disturbing the whole nose, while the long wheelbase and soft rear springing produce a calm gait on open roads.

Hydraulic drums provide credible stopping power by early-1940s standards when properly adjusted, but pedal pressure rises in repeated use and heat produces fade. Pulling, excessive travel, or a hard pedal should not be dismissed as period character. Those symptoms usually point to adjustment, contaminated linings, deteriorated hoses, or hydraulic faults.

Identification and Originality

Serial, Engine, and Fisher Body Numbers

These Cadillacs predate the standardized 17-character VIN. Cadillac used a vehicle or engine serial-number system, and the engine number was also associated with the chassis identity and registration in many jurisdictions. A buyer should compare the number on the engine crankcase, the corresponding frame stamping where accessible, the title, and period Cadillac serial-number references rather than applying a modern VIN decoder.

The Fisher body plate is a separate source of information. It identifies the model-year style number, body sequence, trim, and paint information. The relevant style should be 40-6267 for 1940, 41-6267D for 1941, or 42-6267D for 1942. A body plate alone does not prove that the body and chassis left the factory together.

What Matching Numbers Means Here

On a pre-war Cadillac, matching numbers is not the same exercise as matching every dated casting on a later high-performance car. The central question is whether the identity-bearing engine and chassis information agrees with the title and whether the Fisher body tag is appropriate to the body, year, trim, and paint. An original carburetor, distributor, generator, starter, transmission, axle, and instruments add value, but service replacements were normal during decades of use.

Date-coded and casting-number research should be conducted with Cadillac master parts books, shop manuals, build documentation where available, and evidence from unrestored cars. Restamped engines, replacement data plates, and freshly reproduced tags require particular scrutiny.

Exterior and Interior Details

The grille, hood ornament, parking lamps, bumper guards, wheel covers, dashboard, instruments, and exterior moldings changed across all three years. Installing a visually similar 1941 component on a 1942 car can produce an attractive restoration that remains historically incorrect. The 1940 body's 129-inch chassis also prevents a convincing conversion through trim changes alone.

Correct upholstery grain, seat pattern, carpet treatment, top material, top-pad profile, rear-window form, and painted versus plated hardware matter on a high-level restoration. Fisher paint and trim numbers should guide color selection. A fashionable modern color that lacks support from the tag or factory palette usually reduces the car's appeal to originality-focused collectors.

Hydra-Matic cars require more than a transmission swap. Controls, steering-column hardware, pedals, linkage, mounts, driveshaft details, cooling arrangements, and identification evidence should all agree. Converting a manual car can improve usability, but it does not create a factory Hydra-Matic example.

Variant and Model-Year Breakdown

There were no factory racing, homologation, or limited-edition derivatives of the Series 62 Convertible Coupe during this period. The meaningful variants are the three model years and, for 1941 and 1942, the choice between manual and Hydra-Matic transmission.

Exact production totals attributed specifically to each Convertible Coupe configuration are not presented consistently across surviving references. In particular, manual and Hydra-Matic totals are not reliably separated, so body tags and individual vehicle records remain more useful than broad production claims.

Performance and Dimensional Specifications

Factory material concentrated on rated output and chassis dimensions. Standardized acceleration testing was uncommon, and surviving period performance figures often reflect different axle ratios, transmissions, road conditions, and test methods. Consequently, unsupported 0–60 mph, quarter-mile, top-speed, and curb-weight claims are omitted here.

The 15-horsepower increase for 1941 was meaningful in a heavy open car, but transmission and axle condition strongly affect how any surviving example performs. A worn carburetor, restricted exhaust, retarded ignition, dragging brakes, or incorrect final-drive ratio can erase much of the difference.

Compared With Related Cadillac Models

Series 61

The Series 61 served as Cadillac's less expensive line and shared the 346 V8. In 1941 it also used a 126-inch wheelbase, which can create confusion when incomplete cars have exchanged engines, chassis parts, and trim. The Fisher style number, exterior brightwork, interior appointments, and serial data must support a Series 62 identification.

Series 60 Special

The Fleetwood-bodied Series 60 Special was a four-door sedan with a distinctive roof, formal interior treatment, and influential low-slung proportions. It shared Cadillac's V8 and, in some years, the 126-inch wheelbase dimension, but it was not an open-body counterpart to the 6267D. Its body construction, style number, trim, and market purpose were different.

Series 75

The Series 75 used a longer 136-inch wheelbase and served formal sedan, limousine, and professional-car buyers. It carried the same basic 346-cubic-inch engine family but added length, mass, and passenger capacity. Series 75 chassis or driveline parts should not be assumed interchangeable merely because the engine displacement matches.

Postwar Series 62 Convertible

Cadillac resumed civilian production for 1946 with updated versions of its pre-war designs and the familiar 346 V8. Those cars may look mechanically related, but postwar trim, instruments, body hardware, electrical pieces, and production changes make indiscriminate parts swapping risky. The 1948 Series 62 introduced all-new body styling, and Cadillac's overhead-valve V8 followed for 1949.

Ownership and Restoration Notes

The 346 V8 has a sound reputation when its cooling and lubrication systems remain clean. Trouble usually comes from age, neglected coolant, cracked or corroded water passages, stuck valves, worn guides, tired timing components, oil leaks, and previous machine work performed without correct specifications. Rebuilding one requires a shop familiar with long-stroke side-valve engines, not merely a general modern-engine specialist.

Hydra-Matic expertise is less common than ordinary manual-transmission service. Old seals, worn bushings, contaminated fluid, maladjusted linkage, and incorrect assembly can produce delayed engagement, slipping, harsh changes, or failure to select a range. A prospective owner should locate a specialist before buying a non-operational automatic car, because a complete and correct core has substantial value.

Convertible body restoration is often more expensive than engine work. Water enters around the roof, windshield, cowl, door glass, and rear body well, then attacks floors, inner sills, body mounts, door pillars, and the trunk. Rust or poorly repaired collision damage can allow the body to sag, closing door gaps at the top or preventing the doors and roof from aligning.

Mechanical service parts, ignition pieces, brake components, and some engine internals can be sourced through Cadillac specialists and established vintage suppliers. Correct 1940–1942 trim, grille pieces, gauges, top hardware, cast ornaments, and model-year-specific interior fittings are much harder to replace. Reproduction availability changes, and reproduced pieces vary in profile, plating quality, and fit.

Service should follow the factory shop manual and lubrication chart rather than a modern generic interval. Frequent attention to chassis lubrication, brake adjustment, coolant condition, ignition points, carburetor settings, wheel bearings, and transmission linkage is part of normal ownership. Long storage without fluid changes or periodic exercise creates more problems than modest, regular mileage.

Buyer and Inspection Points

A worthwhile inspection starts with identity and structure, then proceeds to the expensive model-specific equipment. Mechanical faults are rarely cheap, but missing convertible hardware and a compromised Fisher body can turn a complete-looking car into an uneconomic project.

A complete, structurally sound but cosmetically tired car is often a safer purchase than a freshly painted example with undocumented metalwork. Doors that fit only when the car sits on a lift, or a top frame forced into place against misaligned windshield posts, indicate problems that upholstery and paint cannot cure.

Collector and Market Relevance

Open Cadillacs traditionally attract stronger collector attention than equivalent closed Series 62 models because fewer survived and restoration demands are higher. The 1940 has the longest wheelbase and transitional late-1930s visual language. The 1941 combines the cleaner wide-grille body with the first Cadillac availability of Hydra-Matic, while the 1942 carries the scarcity and styling details of a model year interrupted by wartime production controls.

Collectors generally reward correct identity, structural integrity, complete trim, factory colors, accurate upholstery, and a properly fitted roof. A documented original engine and factory-installed Hydra-Matic can strengthen a car's case, but transmission type does not compensate for a replacement body tag, incorrect chassis, or poor metalwork.

The model is recognized within the American Full Classic community, and it appears regularly at Cadillac-LaSalle Club events, concours gatherings, and tours for pre-war automobiles. Its appeal comes from practical road speed, robust mechanical design, and full five-passenger open coachwork rather than a racing record.

Auction interest tends to concentrate on complete, authentically restored cars and unusually preserved examples. Projects must be evaluated cautiously because chrome work, wood and metal top components, interior fabrication, engine machining, and Hydra-Matic rebuilding can consume sums unrelated to the apparent purchase price.

Cultural Relevance

The Series 62's cultural contribution was primarily technological and stylistic. Cadillac put Hydra-Matic into a luxury range at a time when most prestigious automobiles still required a clutch and manual gear selection. That decision helped establish the automatic transmission as appropriate equipment for an expensive American car rather than a novelty confined to lower-priced experimentation.

The 1941 body also expressed the shift from separate fenders and upright grilles toward the broad horizontal front ends that defined postwar American design. The Convertible Coupe displayed that change especially clearly because its low fabric roof and uninterrupted beltline emphasized the car's width.

There was no meaningful factory racing program for the model and no period tuning industry comparable with those surrounding later Cadillac overhead-valve V8s. Club culture instead centers on preservation, touring, judged authenticity, and the accumulated research of Cadillac-LaSalle specialists. Film and event use has made large pre-war convertibles familiar visual shorthand for affluent early-1940s America, but individual screen appearances should not be attributed to a specific year or style without production documentation.

Frequently Asked Questions

What engine is in the 1940–1942 Cadillac Series 62 Convertible Coupe?

All three years used Cadillac's 346-cubic-inch, approximately 5.7-litre, L-head V8. The 1940 version was factory rated at 135 horsepower, while 1941 and 1942 cars were rated at 150 horsepower.

Was Hydra-Matic available in the 1940 Cadillac Series 62?

No. The 1940 Series 62 Convertible Coupe used a three-speed manual transmission. Cadillac offered the four-speed Hydra-Matic automatic beginning with the 1941 model year, and it remained available for 1942.

What do the 6267 and 6267D body codes mean?

They are Fisher body-style identifiers for the Series 62 Convertible Coupe. The 1940 style is 40-6267, while 1941 and 1942 cars are identified as 41-6267D and 42-6267D respectively. These numbers should appear in the proper context on the Fisher body plate.

How can I identify an authentic Series 62 Convertible Coupe?

Check the engine and frame serial information against the title and period Cadillac references, then verify the Fisher body plate, style number, wheelbase, body construction, trim, and model-year-specific front sheet metal. Do not rely on a body tag, grille, or registration document in isolation.

What are the most serious restoration problems?

Structural corrosion in the sills, floors, body mounts, cowl, and trunk is the greatest threat because the convertible body depends on these areas for alignment. Missing top hardware, damaged grille components, cooling-system corrosion, and a failed Hydra-Matic can also add substantial cost.

Are parts available for a 1940–1942 Cadillac Series 62?

Routine brake, ignition, engine, and chassis service parts are available through vintage Cadillac specialists, although supply is not comparable with a mass-produced postwar car. Correct convertible hardware, trim, instruments, grille pieces, and year-specific interior fittings are much more difficult to find.

Which model year is most collectible?

No single year is universally preferred. The 1940 offers the 129-inch chassis and distinct transitional styling, the 1941 combines the redesigned body with first-year Cadillac Hydra-Matic availability, and the 1942 appeals through its shortened civilian production period and unique trim. Condition, authenticity, completeness, and documentation usually matter more than year alone.

Collector Takeaway

The Series 62 Convertible Coupe records three decisive Cadillac developments in a compact span: the 1940 launch of the Series 62, the lower 126-inch redesign and Hydra-Matic option for 1941, and the abrupt end of civilian manufacture in 1942. Beneath those changes remained the 346 L-head V8, an engine whose low-speed pull and conservative construction suited a heavy American convertible better than a peaky specification ever could.

The cars worth pursuing are not necessarily the brightest. They are the examples whose serial information, Fisher tag, body structure, trim, drivetrain, colors, and documentation tell the same story. When those pieces agree, the 6267 or 6267D is one of the clearest surviving demonstrations of how Cadillac joined pre-war coachbuilt formality to the automatic, horizontally styled American luxury car that followed the war.