1930 LaSalle Series 340: A 134-Inch Chassis with Synchro-Mesh

Cadillac Motor Car Company built the 1930 LaSalle Series 340 around a 340-cubic-inch L-head V8 rated at 90 bhp. Approximately 14,995 examples were produced for the model year, and the range used a 134-inch wheelbase beneath Fisher production bodies and more costly Fleetwood coachwork.

LaSalle was General Motors' Cadillac-built companion marque, created to fill the price interval between Buick and Cadillac while giving GM's new Art and Colour Section a prominent design assignment. The Series 340 arrived after the high-volume 1929 Series 328 and before the 1931 Series 345-A, pairing Harley Earl's increasingly influential styling direction with mechanical practice closely related to Cadillac's.

Best known for combining a Cadillac-built V8 and Synchro-Mesh transmission with unusually elegant proportions for its price class, the Series 340 represents the mature form of the first-generation LaSalle before Depression-era economics reshaped the marque.

Quick Facts

The essentials below distinguish the Series 340 from the preceding Series 328 and the later 345-series cars. Series 340 is the factory series designation, not a modern 17-character VIN code or a separately documented engineering project code.

The engine displacement supplied the model number, a convention that makes the 340 relatively straightforward to place within early LaSalle history. Body style, coachbuilder, completeness, and authenticity matter more to collectors than the shared chassis designation alone.

Why the Series 340 Matters

The 1930 LaSalle made Cadillac engineering available below the price of a comparable Cadillac while retaining a distinct visual identity. Its 90 bhp V8, long wheelbase, synchronized transmission, and wide body catalog gave buyers much of the mechanical substance expected from Cadillac without merely reproducing Cadillac's exterior design at a reduced scale.

Its importance is also institutional. The 1927 LaSalle had been the first major production assignment associated with Harley Earl after General Motors brought him from California, helping establish automobile styling as a formal corporate discipline. By 1930, that influence was visible in the Series 340's low visual mass, long hood, disciplined beltline, and integration of radiator shell, lamps, fenders, wheels, and color.

The Series 340 also records a sharp change in the market. LaSalle production had risen strongly during the late 1920s, but the 1930 car reached showrooms as the consequences of the 1929 financial crash began suppressing demand for expensive automobiles. Its production was therefore lower than that of the highly successful 1929 Series 328, despite increased displacement and output.

Historical Context and Development

Cadillac and the Companion-Marque Strategy

General Motors used companion marques during the 1920s to fill perceived price gaps among its established divisions. LaSalle was administered and manufactured by Cadillac, unlike a simple trim line or dealer-installed package, and was sold through Cadillac's retail organization. The car's engineering, assembly standards, and coachwork relationships consequently remained closely tied to Cadillac practice.

The competitive field included upper-medium and luxury automobiles from Packard, Lincoln, Chrysler, Peerless, Pierce-Arrow, and Marmon. Buyers judged these cars by refinement, body selection, dealer reputation, hill-climbing ability, and the social meaning of their badges, not merely by maximum speed.

Design Direction

The Series 340 retained the upright radiator architecture of its period, but its proportions avoided the top-heavy appearance common to many late-1920s sedans. A long hood, closely grouped hood louvers, separate headlamps, flowing front fenders, and a restrained passenger compartment created visual length. Open cars emphasized the effect most clearly, while formal Fleetwood bodies traded some lightness for privacy and ceremony.

Wire wheels, contrasting wheel colors, pinstriping, dual side-mounted spare arrangements on some cars, and trunk or luggage equipment could alter the appearance considerably. Restoration photographs should therefore be compared with body-specific factory literature rather than with another Series 340 wearing different coachwork.

Motorsport and Homologation

The Series 340 was not a homologation model, nor was organized competition its design brief. LaSalle's broader image benefited from the marque's use as the Indianapolis 500 pace car in 1927, but that distinction belongs to the introductory LaSalle rather than specifically to the 1930 Series 340. The 340's historical case rests on production engineering, styling, and luxury-car commerce rather than a factory racing program.

Engine and Drivetrain

The Series 340 used Cadillac's established V8 formula: two banks of four cylinders, side valves, a centrally mounted camshaft, and a substantial crankcase intended to provide smooth torque at modest engine speed. Its nominal 340-cubic-inch displacement came from a 3.375-inch bore and 4.75-inch stroke, dimensions that favor low-speed pulling power over high engine speed.

A single carburetor supplied the naturally aspirated engine, while battery-and-coil ignition and a distributor fired the eight cylinders. Pressure lubrication, a pump-circulated water-cooling system, belt-driven fan, and large cellular radiator addressed the sustained loads imposed by heavy coachwork. Carburetor specification and accessory detail should be checked against the applicable parts book because production changes and decades of substitution can complicate individual cars.

The documented core specifications are more useful than modern estimates of torque or redline, neither of which appears consistently in surviving summaries. Period horsepower was a factory brake rating and should not be compared directly with later standardized net figures.

Synchro-Mesh was a meaningful advance in an era when gear changing often demanded careful double-declutching. It made the upper ratios easier to engage, although first gear and reverse still require the patience appropriate to an early manual transmission. Correct clutch adjustment and engine idle speed are essential if a restored car is to shift as its makers intended.

Chassis, Suspension, and Braking

The Series 340 used a separate steel frame with rigid front and rear axles carried on semi-elliptic leaf springs. Fisher and Fleetwood mounted bodies whose steel panels relied to varying degrees on structural hardwood, a construction method that makes body integrity inseparable from the condition of hidden timber.

Steering was manual through a period steering box and long mechanical linkage. Four-wheel internal-expanding drum brakes provided the stopping system, with mechanical adjustment demanding equal action at each wheel. A properly set-up car should stop predictably, but it cannot provide the reserve, fade resistance, or pedal behavior of a later hydraulic system.

The principal chassis details establish what should be present beneath an authentic car. Wheel and tire equipment could vary with body specification and optional spare-wheel arrangements.

The long wheelbase and substantial unsprung mass favor measured progress rather than abrupt inputs. Worn spring shackles, steering joints, wheel bearings, dampers, or brake linkage can make one car feel dramatically less secure than another, so poor road behavior should not automatically be dismissed as an unavoidable prewar trait.

Driving Experience and Handling Dynamics

The long-stroke V8 delivers its useful work at low engine speed. Throttle response is progressive rather than sharp, and the car gathers speed through torque and gearing instead of revs. A correctly tuned carburetor and ignition system should allow clean pickup without persistent hesitation, backfiring, or overheating.

At parking speed, the large steering wheel and unassisted mechanism require deliberate effort. Once moving, effort decreases, but steering response remains slower than in a postwar independent-front-suspension car. The rigid front axle communicates broken surfaces through the wheel, while the leaf springs permit noticeable body movement if the driver changes direction abruptly.

Synchro-Mesh makes ordinary touring less laborious than it would be in many contemporaries, though the lever still rewards a pause between ratios. The brakes require early planning and firm, progressive pedal pressure. On the roads for which it was built, the 340 would have felt smooth, flexible, and capable of sustained travel, provided the driver respected tire grip, drum-brake heat, and the chassis's high mass.

Identification and Originality

Serial, Engine, and Body Records

A 1930 LaSalle does not carry a modern standardized VIN. Identification instead depends on the factory serial or chassis information, engine number, and the body plate or body number associated with Fisher or Fleetwood coachwork. Locations and number sequences should be verified through a correct 1930 LaSalle shop manual, parts book, build record, or recognized marque archive rather than through an unsupported online decoder.

Series 340 identification must agree across the chassis, engine type, wheelbase, body hardware, and surviving paperwork. Early Cadillac and LaSalle engines are related closely enough in appearance that a later 345-cubic-inch unit or assembled replacement may escape a casual inspection. Engine casting features, stamped unit numbers, bore and stroke documentation, manifolds, accessories, and mounting details all deserve scrutiny.

What Matching Numbers Means on a 1930 LaSalle

The modern phrase matching numbers should be used cautiously. The decisive question is whether the engine and chassis identifiers correspond with factory records or period documentation for that individual car, not whether every ancillary component carries a coordinated date stamp. Carburetors, distributors, generators, starters, water pumps, wheels, and lamps were service items and were frequently exchanged.

Original build sheets, Cadillac or LaSalle historical records, old registrations, period photographs, and body-number evidence can establish provenance. A body swapped between two compatible chassis may still present well, but it is not equivalent to a car retaining its documented factory body.

Coachwork, Trim, and Finish

Fisher and Fleetwood bodies used different construction, trim, and hardware details. Door shapes, windshield frames, landau hardware, division windows, interior fittings, top mechanisms, rumble-seat arrangements, and luggage equipment must be judged against the exact body style, not against a generic image of a 1930 LaSalle.

There is no single correct exterior color for every Series 340. Factory color charts, sales literature, build documentation, and protected paint found beneath fittings provide stronger evidence than modern paint applied during an older restoration. Wheel color, pinstripe placement, plated versus painted hardware, upholstery grain, carpet binding, woodgraining, and instrument finishes often reveal whether a restoration followed the original specification.

Variant and Body-Style Breakdown

LaSalle offered the Series 340 in a broad catalog rather than as separate mechanical trim levels. The table groups the documented coachwork families without assigning unsupported body-style numbers, which should be taken from the relevant Fisher or Fleetwood catalog for the individual car.

Open cars and Fleetwood-bodied examples tend to command the closest collector attention because survival is lower, visual drama is greater, and restoration requires more specialized hardware. That does not make a well-preserved Fisher sedan insignificant. Closed cars often retain more original interior material and can provide better evidence of factory construction.

Performance and Dimensional Specifications

Factory and modern reference material consistently support the wheelbase, displacement, and rated output. Body weight, overall dimensions, axle ratios, and maximum speed differ by coachwork and equipment, while reliable standardized acceleration tests are not generally available for the complete range. It is more accurate to omit a universal 0-60 mph or top-speed claim than to apply a figure from an unidentified body style.

The absence of one universal weight is significant. A roadster, standard Fisher sedan, and formal Fleetwood body place different loads on the same basic chassis, affecting acceleration, hill climbing, braking, and steering effort. Any claimed performance figure should identify the body, axle ratio, test conditions, and source.

Compared With Related LaSalle and Cadillac Models

1929 LaSalle Series 328

The Series 328 directly preceded the 340. Its model designation reflected its smaller 328-cubic-inch V8, commonly rated at 86 bhp, while the 1930 car increased displacement to 340 cubic inches and output to 90 bhp. The 328 enjoyed substantially higher production, making the Series 340 a less common one-year mechanical specification.

1931 LaSalle Series 345-A

The 1931 Series 345-A succeeded the 340 with a 345-cubic-inch V8 and revised model-year details. Because early LaSalle engines and chassis components evolved incrementally, restorations can acquire later parts without obvious visual disruption. A buyer should not accept a 345-series engine as an original 340 simply because it fits neatly and carries Cadillac-family architecture.

1930 Cadillac Series 353

Cadillac's 1930 V8 range used a larger 353-cubic-inch engine and carried the senior marque's name, equipment, body catalog, and pricing. The LaSalle was not merely a short-wheelbase Cadillac with alternate badges. It had its own series identity, dimensions, grille treatment, body offerings, and market price, even though Cadillac engineering and production connected the two closely.

Ownership and Restoration Notes

Engine and Cooling System

A neglected 340 V8 can require specialist machine work rather than a routine modern rebuild. Bearing work, crankshaft condition, valve seats and guides, cylinder wear, oil passages, water jackets, and block or head cracking must be evaluated before cosmetic restoration begins. Internal parts are not as readily available as those for mass-produced postwar American V8s, and apparently minor omissions can require fabrication or a donor assembly.

Cooling problems often reflect several faults acting together: blocked radiator tubes, sediment in the water jackets, a worn pump, incorrect ignition timing, a lean mixture, or missing engine-bay sealing pieces. Replacing the radiator core without cleaning the block may leave the underlying restriction untouched.

Transmission, Axle, and Brakes

A Synchro-Mesh gearbox should not be forced when cold or shifted as quickly as a modern unit. Worn synchronizing parts, bearings, shafts, clutch linkage, or an incorrect lubricant can produce noise and poor engagement. Rear axle work demands attention to gear contact, bearings, seals, and the availability of the correct ratio components.

Mechanical brakes depend on geometry and equalization. Oval drums, worn pins, stretched or incorrectly routed linkage, contaminated linings, and seized pivots can leave the car pulling sharply under braking. Relining the shoes without rebuilding and setting the operating system is rarely sufficient.

Body Structure and Trim

Wood deterioration is among the costliest problems. Doors that have dropped, uneven gaps, a distorted roof, movement around the cowl, or cracked paint at structural joints can indicate failure beneath sound-looking sheet metal. Rebuilding the frame and replacing structural wood must precede final panel fit, paint, and upholstery.

Series-specific lamps, handles, instruments, windshield fittings, top hardware, wheel equipment, and interior pieces can be harder to replace than major mechanical components. Reproduction support exists for selected service and trim items, but complete model-specific hardware is not available on the scale familiar to owners of later collector cars.

Service should follow time and use rather than modern mileage expectations. Frequent lubrication of chassis points, checks of brake adjustment, ignition servicing, cooling-system inspection, wheel-bearing attention, and observation of oil pressure and charging performance are part of normal operation.

Buyer and Inspection Points

A serious inspection should establish identity and structural completeness before judging paint quality. The following checks address the failures and substitutions most likely to change the cost or historical integrity of a Series 340.

Completeness often outweighs the appeal of fresh paint. A tired but intact car with its correct instruments, lamps, carburetor, wheel equipment, interior patterns, and body hardware may be a better restoration candidate than a dismantled project accompanied by several boxes of unrelated parts.

Collector and Market Relevance

Collectors value the Series 340 for its one-year displacement designation, Cadillac manufacture, 134-inch chassis, and place in the first phase of LaSalle design. Open Fisher bodies and formal Fleetwood coachwork usually attract the greatest attention, particularly when body identity and ownership history are documented.

Preservation also matters. An unrestored sedan with sound original upholstery, instruments, woodgraining, paint traces, and body-number evidence can be a more useful historical artifact than a heavily reconstructed open car. Conversely, a properly restored roadster or convertible requires expensive body work, top hardware, plating, upholstery, and mechanical rebuilding, all of which explain its appeal when executed to factory standards.

Auction descriptions sometimes emphasize the Cadillac connection while neglecting whether the engine, body, and trim are correct for a Series 340. Informed buyers separate the genuine engineering relationship from loose claims that a LaSalle is simply a Cadillac wearing another badge.

Cultural Relevance

LaSalle's enduring cultural contribution came through design and corporate organization rather than competition. The marque gave General Motors' styling operation a visible early product, and the 1930 Series 340 shows how quickly coordinated proportions, color, hardware, and coachwork became selling tools alongside horsepower and price.

The cars retain a strong presence in Cadillac and LaSalle club culture, concours preservation, touring events, and Full Classic circles. Their combination of recognizable prewar form and demanding construction also makes them instructive restoration subjects. Engine machining, structural woodworking, panel shaping, plating, upholstery, instrument work, and mechanical-brake setup may all be required on one project.

1930 LaSalle Series 340 FAQs

What engine is in the 1930 LaSalle Series 340?

It uses a Cadillac-built, naturally aspirated 340-cubic-inch L-head V8. Factory literature commonly rates it at 90 bhp, with a 3.375-inch bore and 4.75-inch stroke.

How many 1930 LaSalle Series 340 cars were built?

Model-year production is commonly reported at approximately 14,995 cars. Surviving records do not provide an equally dependable production total for every individual Fisher and Fleetwood body style.

Is Series 340 a chassis code?

Series 340 is LaSalle's factory series designation, derived from the engine's nominal displacement. It is not a modern VIN format, and no separate collector shorthand should replace examination of the chassis, engine, body plate, and factory records.

How can a Series 340 be distinguished from a Series 345-A?

The 340 is the 1930 model with a 340-cubic-inch V8, while the 345-A is the succeeding 1931 series with a 345-cubic-inch engine and revised model-year details. Because components can be interchanged, identification should rely on stamped numbers, documented engine features, body data, and period manuals rather than appearance alone.

Does the 1930 LaSalle have a synchronized transmission?

Yes. The Series 340 used a three-speed manual with Cadillac's Synchro-Mesh system. It reduces the skill required for shifts in the synchronized ratios, but correct clutch adjustment, lubricant, linkage condition, and patient operation remain essential.

What are the most expensive Series 340 restoration problems?

Failed structural wood, incomplete open-body hardware, an incorrect or damaged engine, worn Synchro-Mesh components, and missing coachwork trim can dominate the budget. Paint and upholstery should wait until the frame, timber structure, doors, and panels fit correctly.

Are parts available for a 1930 LaSalle Series 340?

Selected bearings, ignition pieces, brake materials, gaskets, tires, and restoration supplies can be sourced through specialists, clubs, or adapted service channels. Series-specific castings, instruments, lamps, body hardware, and trim are much scarcer and may require rebuilding, fabrication, or carefully verified used parts.

Collector Takeaway

The Series 340 captures LaSalle before economic pressure altered its formula: a Cadillac-built 340-cubic-inch V8, Synchro-Mesh transmission, a full 134-inch chassis, and bodywork shaped under the design culture Harley Earl helped establish at General Motors. Its value as an artifact lies in that complete system, not merely in a vertical grille or a Cadillac connection repeated in an auction catalog.

The best example is not automatically the brightest roadster. It is the car whose engine, chassis, coachwork, fittings, and records still agree, whether it wears a sporting Fisher open body, a formal Fleetwood body, or an unusually intact sedan. Restore one carelessly and it becomes a collage of early GM parts. Preserve or rebuild one correctly and the Series 340 explains, in steel, hardwood, cast iron, and lacquer, why LaSalle changed the way Detroit designed and sold an automobile.