1957–1958 Cadillac Series 62: Fisher Body Style 6239

Cadillac built the Series 62 Six-Window Sedan for the 1957 and 1958 model years with a 365 cu in overhead-valve V-8, rated at 300 gross horsepower in 1957 and 310 in 1958. The four-door body carried Fisher style number 6239, rode a 129.5-inch wheelbase, and used Cadillac's four-speed Hydra-Matic automatic transmission as standard equipment.

Best known for combining Cadillac's late Harley Earl tailfin styling with the practical six-window, center-pillar sedan body, style 6239 represents the conventional closed Cadillac that many affluent American families, executives, and professional owners actually purchased. It lacks the pillarless glamour of the Sedan de Ville, but its stronger roof structure, broad rear doors, and formal greenhouse make it a particularly persuasive example of Cadillac's volume luxury car at the end of the 1950s.

Published model-year records generally list 23,813 examples for 1957 and 13,335 for 1958. The sharp reduction coincided with the 1958 recession and a difficult year for the American luxury-car market, not with a fundamental change in the sedan's engineering. Collectors now value sound, correctly trimmed survivors because restoring the elaborate body brightwork, interior, and model-specific trim can cost far more than rebuilding the familiar Cadillac V-8.

Quick Facts

The following table identifies the specification that separates the six-window sedan from the pillarless Series 62 derivatives. The style number is especially useful because a Cadillac serial number alone does not describe every Fisher Body configuration.

The 6239 designation is a Fisher Body style number rather than a separate Cadillac chassis series or factory project code. It should not be confused with the model serial number, nor should every four-door Series 62 from these years automatically be described as a six-window sedan. Cadillac also sold pillarless four-door bodies whose roof, glass, doors, and trim differ substantially.

Why the Six-Window Sedan Matters

The six-window sedan shows how Cadillac translated show-car proportions into a body intended for regular four-door use. Its center pillars and three side-window openings on each side provided a formal roofline and better sealing than a pillarless hardtop, while the wraparound windshield, low beltline, broad rear quarters, and tailfins delivered the visual drama expected of a late-1950s Cadillac.

It also records a brief engineering phase between the more restrained 1956 Cadillac and the completely redesigned 1959 model. The 1957 car introduced a lower, more sculpted body and a new X-type frame concept across much of the Cadillac range. The 1958 version retained the basic body shell and 129.5-inch wheelbase, but acquired a denser grille, revised ornamentation, additional chrome, and a modest increase in engine output.

This was not a homologation model and Cadillac did not develop it around a competition program. Its historical value lies instead in mass-produced American luxury engineering: a large, high-compression V-8, automatic transmission, power-assisted controls, soft suspension, and enough structural mass to isolate occupants from the road surfaces of its day.

Historical Context and Development

Cadillac at the end of the Harley Earl era

General Motors entered 1957 with Cadillac firmly established as its prestige division. The Series 62 supplied much of Cadillac's volume, below the more ornate Series 60 Special Fleetwood, Series 75 limousines, and Eldorado models. Its direct American rivals included the Lincoln Premiere and Imperial, while Packard's traditional luxury position was rapidly collapsing.

Cadillac styling remained under the broad authority of GM design chief Harley Earl. The 1957 body lowered the visual mass through a flatter hood, panoramic glass, tapered rear quarters, and fins that appeared to grow directly from the body rather than sitting as separate ornaments. On the six-window sedan, the long roof and third side window gave the design a more formal profile than the pillarless Sedan de Ville.

The 1958 facelift added a more elaborate grille texture and heavier surface decoration. Twin headlamps, bright front-fender ornaments, ribbed metal trim, and larger rear detailing made the later car immediately distinguishable when correct parts remain in place. That extra ornament also creates one of the model's principal restoration difficulties, since straight, complete 1958 brightwork is expensive to source and refinish.

Market conditions and engineering priorities

Cadillac customers expected smooth acceleration without manual shifting, low steering effort, strong heating and ventilation, and an interior isolated from engine and axle noise. Engineers therefore concentrated on torque, hydraulic assistance, compliant springing, and driveline refinement rather than low weight or competition-derived handling.

The 1958 recession reduced demand for large luxury cars across Detroit. Cadillac production fell, and the six-window Series 62 sedan's published total declined from 23,813 in 1957 to 13,335 in 1958. The lower 1958 number contributes to present collector interest, although condition and originality usually matter more than the difference in annual production.

Engine and Drivetrain

The 365 cubic-inch Cadillac V-8

The Series 62 used Cadillac's 365 cu in V-8, an enlarged descendant of the division's pioneering 1949 overhead-valve engine. Its 4.00-inch bore and 3.625-inch stroke produced 5,981 cc. A single camshaft sat in the block, operating two overhead valves per cylinder through hydraulic lifters, pushrods, and rocker arms.

A single four-barrel carburetor supplied the standard Series 62 engine. The 1957 version was rated at 300 gross horsepower at 4,800 rpm, while increased compression and model-year revisions raised the 1958 rating to 310 gross horsepower at the same engine speed. These are period SAE gross ratings measured under conditions that do not correspond directly to later SAE net figures.

Conventional breaker-point ignition served a 12-volt electrical system. Lubrication was full-pressure, and the water-cooled engine used a belt-driven fan and engine-driven coolant pump. Air-conditioning cars place a much greater thermal demand on the cooling system, so radiator condition, fan equipment, shrouding, ignition timing, and coolant-passage cleanliness all deserve attention during restoration.

Hydra-Matic and rear axle

Cadillac's four-speed Hydra-Matic was standard, using a fluid coupling and multiple planetary gearsets rather than a conventional manual clutch. It should not be confused with the later three-speed Turbo Hydra-Matic. A correctly adjusted original unit moves away cleanly, performs positive automatic changes, and allows the large V-8 to spend most of its time in its broad torque range.

Drive passes through an open propeller shaft to a hypoid rear axle. Axle ratios could vary with model-year specification and equipment, so an owner should confirm the stamped or physically measured ratio rather than assume that any surviving differential is original.

The core factory engine figures are concise enough to compare directly:

The figures explain the car's road character better than horsepower alone. With 400 lb-ft or more available at a moderate engine speed, the Cadillac does not need aggressive downshifts to move its considerable mass. Carburetor calibration, throttle linkage adjustment, ignition advance, and transmission control adjustment are therefore critical to making a restored car feel as intended.

Chassis, Suspension, Steering, and Brakes

The body is mounted on a separate steel frame with a substantial X-shaped central structure. This design helped Cadillac achieve a low floor and roofline, but it places great importance on the center structure, outriggers, body mounts, and surrounding floor metal. Corrosion in these areas can undermine door fit and body alignment even when the outer panels still present well.

Independent front suspension used unequal-length control arms and coil springs. The rear retained a live axle located by semi-elliptic leaf springs, a durable arrangement that favored load capacity and isolation over precise wheel control. Telescopic hydraulic dampers controlled both ends.

Power-assisted recirculating-ball steering reduced parking effort, although the large steering wheel and slow gearing still require substantial movement. Hydraulic drum brakes operated at all four wheels, with power assistance. The original single-circuit hydraulic arrangement lacks the redundancy of later dual-circuit systems, making hoses, wheel cylinders, hard lines, seals, and adjustment matters of safety rather than cosmetic originality.

These are the principal chassis specifications relevant to service and restoration:

Cadillac offered air suspension during this period, and surviving 1958 cars may be represented as having factory pneumatic equipment. Any such claim requires documentation and inspection of the chassis because many troublesome early systems were removed or converted to conventional springs. A converted car may be usable, but it should not be valued as an intact factory air-suspension example.

Driving Experience and Road Manners

A properly sorted 6239 sedan starts with a subdued V-8 pulse and settles into a quiet idle. Initial throttle response is governed as much by carburetor condition and transmission adjustment as by engine output. When both are correct, the car moves from rest with little strain and builds speed on torque rather than engine revs.

The Hydra-Matic is more mechanically apparent than a later torque-converter automatic. Its changes can be felt, especially under moderate throttle, but they should not be violent or delayed. Excessive flare, a long engagement pause, or persistent fluid leakage signals wear or incorrect adjustment rather than normal period character.

At the steering wheel, assistance is generous and feedback is limited. The long wheelbase calms straight-line movement, while the high-profile bias-ply tires and compliant suspension absorb broken pavement well. Quick direction changes reveal body roll, slow steering response, and the live rear axle, but the pillared six-window shell can feel more structurally settled than a worn pillarless hardtop.

Drum brakes require anticipation. A correctly rebuilt system delivers progressive pedal action in ordinary use, but repeated hard stops generate heat and fade much sooner than modern discs. Unequal adjustment or contaminated linings can also pull the car sharply to one side.

Identification and Originality

Confirming a genuine style 6239

The most useful body clue is the Fisher Body data plate, which should identify style 57-6239 for 1957 or 58-6239 for 1958. The car should have a fixed center pillar and three side-window openings on each side. A pillarless Sedan de Ville body is not converted into a correct six-window sedan by changing badges or exterior trim.

The Cadillac serial number establishes the model year, series, and production identity, while the Fisher plate records the body style, body sequence, trim, and paint information. Because plate formats and plant practices require reference to the appropriate factory literature, buyers should avoid unsupported decoding claims based on a single online chart. Plate attachment, typeface, fasteners, and surrounding paint should also be inspected for evidence of substitution.

Engine, body, and date-coded components

Cadillac identification practice of the period allows the engine unit number to be compared with the vehicle serial information. The stamping must be examined for the correct location and character form using the applicable shop manual or marque reference. Fresh grinding marks, irregular spacing, or a number hidden beneath new paint warrant closer inspection.

A replacement 365 can still make an excellent driving car, but it is different from a documented original-engine example. Later Cadillac 390 cu in engines and assorted replacement components have been installed in many cars because they resemble the 365 and provide compatible service solutions. Casting numbers, casting dates, stamped identifiers, cylinder-head details, intake manifold, carburetor, distributor, generator, starter, and transmission should be considered together.

Date codes on glass, electrical equipment, and cast parts can support an originality claim, but no single date proves that a complete car remains untouched. Dates should precede final assembly by a plausible interval. An implausible mix may reflect ordinary service replacement, a past drivetrain swap, or a reconstruction assembled from several donor cars.

Paint, trim, and factory equipment

The cowl data plate supplies the original paint and trim codes. Verification should be made against a Cadillac color and upholstery reference for the correct model year, since 1957 and 1958 palettes and trim combinations are not interchangeable. Surviving paint beneath weatherstrip, behind door trim, under the package shelf, and inside the trunk can confirm the plate more reliably than an exterior repaint.

Original equipment could include power windows, power seat adjustment, heating and ventilation equipment, radio, Autronic Eye headlamp dimming, and air conditioning, depending on the specific car. The accessory section of the body plate and original sales documentation are preferable to assumptions based on installed hardware. Dealer additions and later retrofits were common.

Model-year-specific grille parts, bumper ends, rear lamps, fin trim, scripts, wheel covers, dashboard fittings, and upholstery patterns are central to a credible restoration. Reproduction soft goods and service parts exist, but much exterior die-cast trim must still be restored from original pieces. A complete but tired car is often a better foundation than a shiny example missing rare fittings.

Variant and Model-Year Breakdown

Within this tightly defined body style, the meaningful division is between the 1957 original design and its 1958 facelift. Production totals below are the commonly published body-style figures rather than totals for the entire Series 62 family.

Neither model year produced a factory competition or homologation derivative of the 6239 sedan. Eldorado engines and multiple-carburetor arrangements belong to different Cadillac specifications. A Series 62 sedan fitted with those parts should be documented as modified unless factory records prove otherwise.

Performance and Dimensional Specifications

Factory dimensions are more consistent than acceleration figures for this body. Period road tests often covered a Coupe de Ville, Eldorado, or differently equipped Cadillac, and their results should not automatically be assigned to the heavier six-window sedan. For that reason, unsupported 0-60 mph, quarter-mile, curb-weight, and top-speed claims are omitted here.

Published weights differ according to whether a source lists shipping weight, curb weight, accessories, or test weight with fuel and occupants. Air conditioning, power accessories, and other equipment can materially alter the figure. Any performance comparison should therefore identify the particular car and the weighing standard used.

Compared With Related Cadillacs

Series 62 Sedan versus Sedan de Ville

The six-window 6239 is a pillared sedan, while the Sedan de Ville emphasizes pillarless hardtop styling. The two may share major mechanical components, but their roof structures, window mechanisms, door glass, weather sealing, and much exterior trim are different. The hardtop generally attracts buyers seeking an open side profile, whereas the 6239 offers a more formal roof and fewer hardtop-specific sealing complications.

Series 62 versus Series 60 Special Fleetwood

The Fleetwood-bodied Series 60 Special carried more formal trim and a separate model identity above the Series 62. It should not be identified merely by fitting Fleetwood emblems or additional brightwork to a Series 62 shell. Body plate information, wheelbase, roof treatment, interior appointments, and model-specific exterior panels must agree.

1956, 1957–1958, and 1959

The 1956 Cadillac has a more upright body and smaller fins, despite sharing the broad mechanical ancestry of the 365 V-8. The 1957 redesign lowered and widened the visual package, while the 1958 facelift increased ornament without changing the basic body architecture.

For 1959 Cadillac introduced an entirely new body with dramatically larger fins, deeply sculpted rear lamps, and a different overall structure. Although the 1959 car dominates popular images of the tailfin Cadillac, the 1957 and 1958 sedans are mechanically and visually distinct and should not be restored with later trim or 390-engine components simply because those parts are more familiar.

Ownership and Restoration Notes

Body and frame work

Rust is the decisive financial issue. Inspect the central frame structure, outriggers, body mounts, rocker panels, front and rear floor pans, lower fenders, rear quarter panels, wheel openings, trunk floor, spare-wheel well, and the metal beneath the windshield and rear-window seals. A body can retain presentable paint while suffering serious decay underneath broad stainless moldings and undercoating.

Door gaps reveal structural trouble quickly. Sagging rear doors, inconsistent roof openings, or a body that changes gaps when lifted may indicate frame corrosion, failed mounts, or previous collision repair. The panoramic glass makes roof and pillar alignment particularly important, and correcting a distorted aperture can consume many hours before chrome or paint work begins.

Engine, cooling, and fuel system

The 365 V-8 is durable when clean oil, correct ignition timing, and an effective cooling system are maintained. Age-related problems include hardened seals, rear-main and rocker-cover leakage, timing-chain wear, noisy valve gear, worn distributor mechanisms, carburetor leakage, and restricted cooling passages. A car that runs cool at idle but overheats on the road may have different faults from one that overheats only in traffic, so diagnosis should precede radiator replacement.

Modern fuel can expose old hoses, accelerator-pump parts, and carburetor floats. Any dormant car requires careful inspection of its fuel tank, pickup, lines, pump, and carburetor before repeated starting attempts. Fuel leakage above a hot Cadillac intake manifold is not a defect to defer.

Hydra-Matic, steering, and brakes

The original Hydra-Matic requires a specialist familiar with early dual-coupling and fluid-coupling automatics. Linkage adjustment and fluid condition should be checked before assuming that hard or poorly timed shifts require a full rebuild. Internal parts and expertise are less universally available than for later GM automatics.

Power-steering hoses, seals, control components, and the steering gear commonly leak after long storage. Brake restoration should include all hydraulic components unless recent work is documented. New linings must be correctly arced and adjusted if the car is to stop evenly.

Trim, glass, and interior

Mechanical service parts are generally easier to find than excellent exterior trim. Bumpers, grille pieces, fin moldings, scripts, die-cast ornaments, wheel covers, dashboard hardware, and year-specific lamps can turn an apparently inexpensive project into a costly search. Chrome plating also requires careful metal repair before finishing, particularly on pitted castings.

Interior restoration demands the correct upholstery pattern, cloth or leather combination, headliner, door-panel construction, bright trim, and carpet treatment. Generic pleated upholstery may look tidy but materially weakens a car presented as factory-correct. Original trim samples hidden under seats or behind panels should be preserved for color and grain matching.

Buyer and Inspection Points

A serious inspection should establish identity and structural condition before assessing paint shine or engine smoothness. The following checks address the failures most likely to change the economics of a purchase.

Inspection on a lift is essential. A road test alone cannot reveal concealed frame corrosion, old collision pulls, patched floors, or failing body mounts. Conversely, a faded but complete, dry-state survivor with intact trim can be a stronger purchase than a recently painted car with hidden structure and incorrect details.

Collector and Market Relevance

Two-door hardtops and convertibles usually command the broadest attention in the 1950s Cadillac market, but that hierarchy does not make every sedan interchangeable. The style 6239 appeals to collectors who want the long-roofed, six-window silhouette, straightforward door and glass arrangement, and a body that reflects the Cadillac most often used as a full-size luxury sedan rather than a leisure model.

The 1958 version's lower published production gives it numerical scarcity, while the cleaner 1957 treatment has its own following. Market quality depends heavily on completeness, original color and trim, structural integrity, and the standard of chrome and interior work. A documented original car can be more compelling than a restored example whose brightwork, upholstery, engine, and accessories come from several model years.

There is no factory racing legacy to inflate values, and modified examples should be judged on workmanship rather than invented competition associations. Period customs, mild lowering, aftermarket air conditioning, radial tires, and updated brakes may improve a driver's usefulness, but they move the car away from preservation-class judging. Reversible changes are generally easier for collectors to accept.

Cultural Relevance

The 1957 and 1958 Cadillacs capture the final progression toward the extravagant 1959 design. Their tailfins, panoramic glass, twin-headlamp faces, extensive brightwork, and broad stance made them visual shorthand for prosperous postwar America, yet the six-window sedan remained a practical object with six-passenger accommodation and a large luggage compartment.

Cadillac and LaSalle club activity has preserved technical knowledge, parts interchange information, judging standards, and factory literature for these cars. The model also has a long history in American custom-car culture, where low ride height, broad whitewall tires, and simplified trim suit its proportions. Such customs occupy a different collecting category from correctly restored style 6239 sedans, and neither should be represented as the other.

Frequently Asked Questions

What engine did the 1957 Cadillac Series 62 Six-Window Sedan use?

It used Cadillac's 365 cu in, 5,981 cc, overhead-valve V-8 with a single four-barrel carburetor. Factory output was 300 gross horsepower at 4,800 rpm and 400 lb-ft of torque at 3,200 rpm.

How did the 1958 engine differ?

The displacement, bore, and stroke remained unchanged, but the compression ratio increased to 10.25:1 and factory output rose to 310 gross horsepower. Cadillac listed 405 lb-ft of torque at 3,200 rpm.

How can I identify a genuine six-window Series 62 sedan?

Look for the fixed center pillar, three side-window openings per side, and a Fisher Body plate showing style 57-6239 or 58-6239. Confirm the serial number and plate details against the correct Cadillac factory references before accepting an identity claim.

Is style 6239 a chassis code?

No. It is the Fisher Body style designation for the Series 62 six-window sedan. Cadillac serial information and Fisher body-style information serve related but different identification functions.

How many were built?

Commonly published body-style totals list 23,813 for 1957 and 13,335 for 1958. These figures apply to the standard Series 62 six-window sedan, not to every Series 62 or every four-door Cadillac produced in those years.

What are the most expensive restoration problems?

Severe X-frame and body-mount corrosion, missing exterior brightwork, panoramic-glass aperture repair, complete interior retrimming, and Hydra-Matic rebuilding can dominate the budget. Buying a complete, structurally sound car usually saves more money than beginning with an inexpensive but dismantled project.

Are mechanical parts available?

Routine engine, ignition, brake, suspension, and fuel-system service parts can be sourced through Cadillac specialists and established vintage-car suppliers. Correct body trim, interior hardware, accessory components, and model-year-specific die-cast pieces are considerably harder to find.

Collector Takeaway

The style 6239 sedan is the clearest four-door expression of Cadillac's 1957 and 1958 engineering package: a 365 cu in V-8, four-speed Hydra-Matic, 129.5-inch chassis, six-window Fisher body, and the tailfin styling that preceded the division's radical 1959 redesign. Its appeal does not depend on a rare engine or racing pedigree. It comes from the fidelity with which it records Cadillac's mainstream luxury product during two sharply contrasting sales years.

Buy the body, trim, and documentation before buying the paint. A dry, complete 6239 with its original identifiers and interior evidence is worth preserving even when mechanically tired, because engines and brakes can be rebuilt more readily than missing grille castings, distorted glass openings, or a rusted X-frame can be made correct. Restored with restraint, the six-window sedan explains late-1950s Cadillac better than a collection of fins and chrome ever could.