Quick Facts

The following table establishes the specifications that define a genuine 1931 Series 355-A. Body dimensions and equipment can differ because Cadillac sold numerous styles on standard and extended chassis.

The letter suffix is essential. A 355-A is specifically the 1931 version, not a blanket name for every Cadillac V8 built from 1931 through 1935. Later 355-B, 355-C, and 355-D cars differ in styling, chassis details, and body construction.

Why the Series 355-A Matters

Cadillac introduced its V-16 for 1930 and added the V-12 for 1931, but the V8 remained the volume engine on which the division depended. The 355-A therefore carried much of Cadillac's commercial burden while sharing showroom space with two of the most elaborate multicylinder automobiles produced in Detroit.

The car also illustrates how a large manufacturer combined standardized mechanical parts with coachbuilt presentation. Fisher supplied many regular catalog bodies, while Fleetwood produced more formal and specialized styles. The result was not one visually uniform 355-A but a chassis and powertrain expressed through coupes, convertibles, owner-driver sedans, seven-passenger cars, limousines, and division-window bodies.

For restorers, that variety has consequences. A correct engine and chassis do not automatically make a correct car. Doors, belt moldings, windshield frames, interior divisions, rear-quarter structures, hardware, and seating arrangements can be unique to a particular body style.

Historical Context and Development

Cadillac in 1931

The 355-A arrived as the Depression sharply reduced demand for expensive automobiles. Cadillac and companion marque LaSalle competed with Packard, Lincoln, Pierce-Arrow, and Marmon, all of which offered large engines, formal coachwork, or both. Cadillac answered with a wide mechanical range: LaSalle below it, the Cadillac V8 at the core of the line, and the V-12 and V-16 above it.

The 355-A evolved rather than discarded Cadillac's recent engineering. Its engine followed the side-valve V8 pattern Cadillac had refined over many years, while Synchro-Mesh reduced the need for the deliberate double-clutching associated with older unsynchronized transmissions. Four-wheel brakes, a strong ladder frame, and long semi-elliptic springs reflected proven practice for a heavy luxury automobile.

Design Direction

The 1931 body retained separate fenders, running boards, a near-vertical radiator, and a tall passenger compartment. Its hood appeared longer and cleaner than that of many earlier Cadillacs, with five vertical ventilation doors on each side providing one of the useful visual distinctions from the preceding Series 353.

Closed Fisher bodies generally look more restrained, with practical door openings and owner-driver interiors. Fleetwood styles can carry lower rooflines, formal rear compartments, division windows, more elaborate upholstery, and body-specific moldings. On either, the relationship among radiator height, wheel diameter, hood length, and upright greenhouse gives the 355-A its unmistakably early-1930s stance.

No Homologation or Factory Competition Mission

The Series 355-A was not a homologation special and Cadillac did not develop it around organized racing. Its engineering priorities were smooth low-speed operation, durability, quietness, controlled braking, and the ability to propel substantial coachwork. Any competition history belongs to individual privately entered cars rather than a defined factory motorsport program.

Engine and Drivetrain

Cadillac's V8 used a 90-degree cylinder-bank angle and side valves, placing the valves in the block rather than in overhead cylinder heads. The architecture limited high-speed breathing compared with later overhead-valve engines, but it produced the smooth, low-revving delivery expected in a large luxury car.

Period references generally describe the engine as 353 cubic inches even though Cadillac's series designation rounded the figure to 355. Its 3 3/8-inch bore and 4 15/16-inch stroke produced a long-stroke engine whose useful work occurred at modest crankshaft speed. The factory rating was 95 horsepower, commonly quoted at 3,000 rpm.

A single carburetor supplied the engine, with a mechanical fuel pump replacing the dependence on an older vacuum-tank arrangement. Battery-and-coil ignition, a distributor, pressure lubrication, water-pump cooling, and thermostatically controlled radiator shutters formed a conventional but carefully integrated system. Exact carburetor and electrical component applications should be checked against the car's build date and Cadillac parts literature because surviving cars have often acquired later service replacements.

The dry single-plate clutch fed Cadillac's three-speed Synchro-Mesh gearbox. Synchronization on the upper ratios made routine shifting easier, although first gear remained a low-speed starting ratio and still rewards a pause before engagement. The transmission drove a conventional live rear axle.

This table confines itself to specifications consistently associated with the 355-A engine and drivetrain. Torque, compression ratio, and maximum permissible engine speed are omitted because surviving period references do not present those figures consistently enough for a universal claim.

The long stroke and modest rated speed explain the way the engine should be used. It is not intended to be extended through the gears like a later short-stroke V8. Correct ignition timing, carburetor adjustment, valve clearances, and cooling-system condition matter more than chasing a modern-looking power figure.

Chassis, Suspension, and Braking

The 355-A used a separate steel frame with rigid front and live rear axles. Semi-elliptic leaf springs controlled both ends, a standard solution for a substantial car before Cadillac adopted independent front suspension later in the decade. Steering was by a mechanical steering box without power assistance.

Braking came from mechanically operated internal-expanding drums at all four wheels, with vacuum assistance reducing the physical effort required. Correct rod adjustment, equalization, drum condition, and lining geometry are essential. A poorly set up system can pull or require excessive pedal pressure, while a properly restored system is far more capable than its basic description suggests.

These chassis figures help distinguish standard passenger-car forms from extended formal coachwork. Body dimensions and curb weights are not treated as universal because the catalog ranged from compact two-passenger bodies to long, heavily trimmed formal cars.

The extended chassis should not be treated as a stretched standard car assembled later in life. A genuine long-wheelbase Fleetwood requires supporting frame, body, number, and build-record evidence. Conversions can resemble formal catalog styles at a glance but rarely reproduce their structure or proportions correctly.

Driving Experience and Road Manners

A properly sorted 355-A starts with a restrained exhaust note and settles into a slow, even idle. Throttle response is progressive rather than sharp, and the engine supplies its best work through low and middle speeds. The driver uses torque and measured gear changes instead of high engine speed.

At parking pace, the steering is heavy, especially with aged tires or dry linkage. Once moving, the large steering wheel provides useful leverage and the car tracks with the deliberate stability expected from a long wheelbase and beam front axle. Free play beyond the factory allowance usually points to wear in the steering box, kingpins, tie-rod ends, or spring shackles rather than inherent vagueness.

The leaf-sprung chassis moves noticeably over undulating surfaces, and tall closed bodies generate more roll than a coupe or open two-seater. On roads of 1931, the long springs, high-profile tires, and substantial unsprung mass favored ride isolation and straight-line composure. Modern radial tires, excessive tire pressure, or incorrectly valved replacement dampers can make the car feel harsher and less coherent than intended.

Synchro-Mesh makes second-to-third and third-to-second shifts less demanding than in many older luxury cars, but the lever still prefers a deliberate hand. The brake pedal should feel progressive after its initial movement. Pulling, judder, or a delayed response indicates adjustment or component problems and should never be dismissed as normal prewar behavior.

Identification and Originality

Serial, Engine, and Body Numbers

The 355-A predates the standardized 17-character VIN by decades. Identification depends on the factory serial or engine number, frame stamping where present, and the Fisher or Fleetwood body tag. Buyers should compare every stamping with Cadillac build records and recognized Cadillac-LaSalle Club references rather than applying a modern VIN decoder.

Cadillac identification practice in this period closely linked the engine or unit number to the car's recorded identity. A matching-numbers claim should therefore mean more than an engine of the correct type. The stamping format, location, typography, sequence, and correspondence with the build record all require examination.

The body tag is equally important. It can identify the coachbuilder and style information needed to confirm whether a sedan, coupe, convertible, limousine, or town car began life in that form. Open bodies converted from closed cars, shortened formal bodies, and cars assembled from separate chassis and coachwork can carry genuine Cadillac parts without representing a factory-built combination.

Correct 1931 Details

The five vertical hood doors on each side are a useful external cue, but they are not sufficient proof. Radiator shell shape, hood length, fender profile, splash aprons, running-board treatment, lamp hardware, wheel equipment, dashboard layout, and body moldings must agree with the particular Fisher or Fleetwood style.

The instrument panel retained an oval grouping influenced by the preceding Series 353. The battery and tool storage were placed beneath the front seat, while metal floorboards replaced the wooden floorboards Cadillac had used previously. Surviving cars often have altered battery arrangements, supplementary gauges, electric fuel pumps, turn signals, sealed-beam conversions, or later generators.

Paint, Upholstery, and Hardware

There is no responsible universal paint-code list for every 355-A because colors, trim combinations, and Fleetwood orders could vary. The build sheet, body tag, protected paint found beneath moldings, upholstery remnants, and period Cadillac color literature provide stronger evidence than a color selected from a generic prewar chart.

Closed-body restoration must account for structural wood beneath the visible skin. Door fit can be altered by rotten pillars, roof rails, sills, or hinge mounts even when the exterior metal appears presentable. Correct broadcloth, leather, carpets, plated fittings, interior wood finish, division hardware, and top material can account for a large portion of restoration cost.

Reproduction service parts are available for selected mechanical and cosmetic items, but body-specific Fleetwood hardware is often repaired, recast, or fabricated. Modern fasteners, incorrect pleat patterns, vinyl in place of leather or cloth, generic door handles, and later carburetors are common deductions on otherwise attractive restorations.

Variant and Body-Style Breakdown

Cadillac offered the 355-A as a mechanically related range rather than a single body style. Factory catalogs and surviving records should be consulted for exact style numbers, but the principal distinctions are summarized below without assigning unsupported production totals to individual bodies.

Individual body scarcity can differ sharply from total Series 355-A production. Open cars and distinctive Fleetwood formal bodies generally survive in smaller numbers than standard sedans, but a rarity claim should be supported by body-style production records rather than inferred from the number of examples seen at shows.

Performance and Dimensional Specifications

Standardized acceleration and top-speed testing was not routinely published for every 355-A body. Weight, axle ratio, coachwork, weather, and test method could materially change results, so unsupported zero-to-60 mph or quarter-mile figures are omitted.

Overall length and weight must be tied to a specific body style. Publishing one curb weight for every 355-A would erase the substantial difference between a short open car and a fully equipped division-window limousine.

Compared With Related Cadillac Models

1930 Series 353

The Series 353 is the direct predecessor and the car most likely to be confused with a 355-A. The 1931 model retained the basic V8 concept but introduced revised body and chassis details, including the distinctive five-door hood-side treatment, metal floorboards, and changes to storage and equipment placement. A re-bodied or incorrectly restored car can mix parts from both years, making tags and factory records decisive.

1932 Series 355-B

The 355-B continued the V8 line for 1932 with revised styling and engineering detail. It should not be described as a 355-A merely because both cars belong to the Series 355 family and use a V8 of the same general size. Grille, hood, fenders, body hardware, chassis components, and serial information separate the two.

Cadillac V-12 and V-16

Cadillac's 1931 V-12 and V-16 models offered greater cylinder count, higher cost, longer or heavier chassis applications, and more elaborate prestige coachwork. The 355-A is mechanically less complex and was produced in greater volume, which can make engine and chassis work more approachable. It is not a small car, however, and a large Fleetwood 355-A can demand restoration work similar in scale to the multicylinder models.

LaSalle

LaSalle served as General Motors' companion marque below Cadillac and shared aspects of corporate design and production practice. A LaSalle body or component should not be assumed interchangeable simply because it appears similar. Wheelbase, sheet metal, instruments, trim, engine specification, and identification details require model-specific verification.

Ownership and Restoration Notes

Engine and Cooling System

The Cadillac side-valve V8 is durable when assembled with correct clearances and supplied with clean oil, but neglect can make a rebuild expensive. Inspect oil pressure hot, listen for bearing noise, check for cracked castings and coolant leakage, and verify that the block's water passages are not packed with scale. Overheating may involve the radiator core, water pump, shutter thermostat, ignition timing, lean mixture, sediment, or several faults at once.

Engine work should go to a shop familiar with large prewar side-valve engines. Crankshaft condition, bearing fit, valve-seat work, camshaft and lifter wear, oil-pump clearances, and internal corrosion require more than a cosmetic gasket replacement. Before commissioning machining, confirm that the engine is the unit intended to remain with the car.

Fuel, Ignition, and Electrical Equipment

Old fuel tanks shed contamination, while modern fuel can attack incompatible hose, pump diaphragms, and carburetor materials. An auxiliary electric pump is sometimes fitted for priming, but visible modern plumbing harms authenticity and excessive pressure can overwhelm the carburetor. Distributor wear, poor grounds, deteriorated wiring, and an incorrect charging-system setup commonly produce starting complaints blamed on the engine.

Transmission, Axle, and Brakes

Synchro-Mesh parts are specialized and should not be treated like components from a later mass-produced gearbox. Check for gear noise, jumping out of ratio, worn shafts, clutch drag, and synchronizer deterioration. Rear-axle whine may indicate wear or incorrect setup, both of which require careful measurement rather than heavier lubricant as a cure.

The mechanical brake system depends on the condition of the entire linkage. Worn clevises, seized pivots, mismatched linings, out-of-round drums, and incorrect equalization accumulate into poor braking. The vacuum-assist apparatus and its hoses also need inspection for leakage and proper operation.

Body Structure and Corrosion

Structural wood is often the decisive restoration issue. Inspect sills, door pillars, roof framing, rear body corners, hinge mounts, and the structure around a convertible top or formal division. Fresh paint can conceal a body whose doors no longer align because the underlying wood has failed.

Metal corrosion typically appears in fender beads, splash aprons, running-board supports, lower doors, body mounts, trunk or rear-floor areas, and seams where moisture sits against wood. Rebuilding the wood skeleton while preserving the original metal skin requires a specialist capable of traditional coachbuilding, not simply a modern collision shop.

Service and Parts Support

Routine attention should include oil level and condition, chassis lubrication, ignition points, coolant, fan belt, steering joints, spring shackles, brake linkage, wheel bearings, and tire condition. Service intervals should follow the Cadillac owner's manual and lubrication chart because these cars have more frequent lubrication points than a postwar automobile.

Mechanical service parts, ignition items, bearings, gaskets, brake linings, and some rubber pieces can be sourced through prewar Cadillac specialists or reproduced. Correct lamps, instruments, cast handles, windshield hardware, Fleetwood trim, and body-specific interior fittings are substantially harder to find. Buying an incomplete formal body because the engine runs is often a costly mistake.

Buyer and Inspection Points

A 355-A inspection should begin with identity and structure before turning to paint quality or engine sound. The following checks address the areas most likely to change a project's cost or historical credibility.

The least expensive purchase is often the complete, correctly identified car with an older restoration, not the freshly painted project missing its original instruments and body hardware. Mechanical faults can usually be defined and repaired. Recreating undocumented Fleetwood trim or rebuilding a collapsed wooden body can consume years.

Collector and Market Relevance

Collectors separate 355-A cars primarily by body style, coachbuilder, authenticity, and completeness. Open Fisher bodies and distinctive Fleetwood coachwork generally receive more attention than common closed sedans, but an original, documented sedan can be more historically convincing than a convertible assembled from unrelated components.

The 355-A's eligibility for major prewar touring and concours activities adds practical appeal. It offers a recognized Cadillac V8, usable Synchro-Mesh transmission, and enough production volume to support marque knowledge without making every service item unobtainable. Exact eligibility for a particular club class should always be confirmed against that organization's current list and the car's documented configuration.

Auction results can vary widely because the label “1931 Cadillac” conceals major differences in body, wheelbase, restoration age, provenance, and authenticity. Serious buyers value an original body on its proper chassis, a documented engine identity, correct trim, sound structural wood, and restoration work supported by photographs and invoices. Cosmetic shine alone has little meaning when the body skeleton, brake linkage, or cooling system remains unexamined.

Cultural Relevance

The 355-A belongs to the period when American luxury manufacturers still offered catalogs resembling those of traditional coachbuilders. A customer could select a practical owner-driven body or a chauffeur-operated formal car while retaining the same basic V8 identity. That breadth explains the model's frequent presence at Cadillac-LaSalle Club events, Classic Car Club of America activities, concours fields, and prewar touring gatherings.

Its significance does not rest on a factory racing record or a famous tuning industry. Instead, it documents General Motors' ability to combine Fisher manufacturing scale, Fleetwood craft, and Cadillac mechanical engineering under one sales organization. Surviving formal cars also preserve details of chauffeur-era travel, including division windows, occasional seating, speaking hardware, privacy fittings, and rear-compartment materials.

Period-style appearances in film and television often use large Cadillacs as shorthand for wealth, government, or organized power, but body substitutions are common and screen identifications should be checked carefully. A vertical radiator and wire wheels do not by themselves identify a 355-A.

1931 Cadillac Series 355-A FAQs

What engine is in the 1931 Cadillac Series 355-A?

It uses Cadillac's naturally aspirated 90-degree L-head V8, commonly listed at 353 cubic inches or approximately 5.8 liters. Factory output is generally quoted as 95 horsepower at 3,000 rpm.

Why is it called the Series 355 if the engine is listed as 353 cubic inches?

Cadillac used the rounded 355 designation for the model series. Period and later specifications commonly calculate or list the bore-and-stroke displacement at approximately 353 cubic inches, so both figures appear in reliable descriptions of the car.

How can I identify a genuine 1931 Series 355-A?

Check the engine or serial number, frame markings where present, Fisher or Fleetwood body tag, wheelbase, and body-style details against Cadillac build records. The five hood-side ventilation doors are useful visual evidence, but they cannot establish identity on their own.

What is the difference between a 355-A and a 355-B?

The 355-A is the 1931 model, while the 355-B is the revised 1932 version. They differ in identification sequence, body and front-end styling, chassis details, and numerous pieces of trim, even though both belong to the Series 355 V8 family.

Did every 355-A use the same wheelbase?

No. The standard passenger-car wheelbase was 134 inches, while applicable Fleetwood formal bodies were available on a 152-inch chassis. The wheelbase must agree with the body style and factory documentation.

What are the most expensive 355-A restoration problems?

Failed structural wood, incomplete Fleetwood hardware, incorrect or missing instruments, a damaged cooling system, and a V8 requiring extensive machining can dominate the budget. A converted body or undocumented chassis-body combination also creates an authenticity problem that money alone may not resolve.

Are parts available for a 1931 Cadillac 355-A?

Selected engine, ignition, brake, bearing, gasket, and rubber parts are available through prewar Cadillac specialists and reproduction suppliers. Correct body hardware, lamps, instruments, moldings, convertible fittings, and Fleetwood interior pieces are much scarcer and often require restoration or fabrication.

Collector Takeaway

The 1931 Series 355-A is the Cadillac to study if one wants to understand how the division supported an enormous catalog of bodies with one proven V8 chassis during the Depression. Its 353-cubic-inch side-valve engine, Synchro-Mesh gearbox, 134-inch standard chassis, and available 152-inch Fleetwood platform created cars ranging from restrained coupes to chauffeur-driven formal limousines.

The best example is not automatically the rarest body or the brightest restoration. It is the car whose engine, chassis, coachwork, body tag, dimensions, hardware, and build record tell the same story. When those elements remain intact, the 355-A preserves both sides of 1931 Cadillac production: industrial engineering beneath, and Fisher or Fleetwood craft above.