Vapor lock and carburetor fuel delivery failure
high- Typically appears
- Any mileage / any warm-weather operation
- Estimated repair
- $150 – $600
1926 Cadillac
Type V-63Phaeton
314 CI V8 · Phaeton
The 1926 Cadillac Type V-63 Phaeton is a pre-Depression-era American luxury automobile powered by Cadillac's landmark 314-cubic-inch (5.1L) side-valve V8 — a design that helped cement Cadillac's reputation as "the standard of the world." The V-63 series was introduced in 1924 and carried through 1927, featuring a ladder-frame chassis, mechanical four-wheel brakes (a significant engineering step for the era), and open-air coachwork that defines the classic Phaeton body style. As a nearly 100-year-old vehicle, the Type V-63 is firmly in collector and show-car territory. It is not a daily driver by any measure — it predates modern safety systems, emissions controls, 12-volt electrics, and even leaded-fuel-optimized valve seats in the modern sense. Owning one demands patience, specialized knowledge, and a network of vendors who deal in antique Cadillac parts. At Lake Geneva shows and summer cruises, this car turns every head on the road. But it is a project and a passion first, a transportation appliance never. Budget generously for restoration, ongoing preservation, and specialist labor — there are very few shops in the country with hands-on experience with this engine.
Reliability
3/5
Verified data
Engine
314 CI (5.1L) Flathead V8
Drivetrain
RWD
Fuel
Gasoline
MPG
8 city / 13 hwy / 10 combined
Seats
5
Doors
4
Body
Convertible
MSRP
$3,295
Overview
AI-curatedThe 1926 Cadillac Type V-63 Phaeton is a pre-Depression-era American luxury automobile powered by Cadillac's landmark 314-cubic-inch (5.1L) side-valve V8 — a design that helped cement Cadillac's reputation as "the standard of the world." The V-63 series was introduced in 1924 and carried through 1927, featuring a ladder-frame chassis, mechanical four-wheel brakes (a significant engineering step for the era), and open-air coachwork that defines the classic Phaeton body style. As a nearly 100-year-old vehicle, the Type V-63 is firmly in collector and show-car territory. It is not a daily driver by any measure — it predates modern safety systems, emissions controls, 12-volt electrics, and even leaded-fuel-optimized valve seats in the modern sense. Owning one demands patience, specialized knowledge, and a network of vendors who deal in antique Cadillac parts. At Lake Geneva shows and summer cruises, this car turns every head on the road. But it is a project and a passion first, a transportation appliance never. Budget generously for restoration, ongoing preservation, and specialist labor — there are very few shops in the country with hands-on experience with this engine.
Known for
- Cadillac's early 314 CI side-valve (flathead) V8 — one of the first commercially successful V8s in a luxury car
- Elegant open Phaeton coachwork with fold-flat windshield and removable side curtains
- Four-wheel mechanical drum brakes — a genuine engineering advancement for 1924–1927
- Extremely low production numbers; surviving examples are rare collector pieces
- Linen-upholstered, wood-trimmed interior representative of 1920s American coachbuilding craftsmanship
Best for
- Serious antique car collectors and restorers
- AACA, Cadillac-LaSalle Club, and Glidden Tour participants
- Concours d'Elegance and show-circuit enthusiasts
- Owners who enjoy hands-on mechanical work on historic machinery
- Estate or museum display as a centerpiece American artifact
Watch for
- No OBD, no ECU, no modern diagnostics — all fault-finding is hands-on and experience-based
- 6-volt positive-ground electrical system is incompatible with virtually all modern accessories
- Soft-top and side curtains on Phaeton body provide minimal weather protection — not suitable for Wisconsin winter driving
- Parts availability is extremely limited; many components must be machined or sourced from specialist vendors or donor cars
- Ethanol-blended fuels (E10/E15) can damage original rubber fuel lines, carburetor floats, and gaskets
Common issues by mileage
6 knownBabbitt main and rod bearing wear or failure
high- Typically appears
- Any mileage on unrestored engine
- Estimated repair
- $800 – $3,500
Ignition points, condenser, and timing drift
high- Typically appears
- Any — wear accelerates with infrequent use
- Estimated repair
- $50 – $300
Cooling system leaks and overheating (hoses, water pump, radiator)
high- Typically appears
- Any — original rubber and solder-seamed radiators are near end of life
- Estimated repair
- $300 – $2,500
6-volt electrical system failures (generator, voltage regulator, wiring insulation)
medium- Typically appears
- Any — especially on cars with aged cloth-wrapped wiring
- Estimated repair
- $200 – $1,200
Mechanical brake adjustment and linkage deterioration
medium- Typically appears
- Any — cables, rods, and clevis pins corrode and seize over decades
- Estimated repair
- $150 – $800
Maintenance schedule
- 1 Every fill-up Use ethanol-free (pure) gasoline
Ethanol attacks original cork floats, rubber fuel lines, and carburetor gaskets. Ethanol-free fuel is widely available in Wisconsin and is essential for preserving original or rebuilt fuel system components.
- 2 Every 1,000–1,500 miles or annually Engine oil and filter change — use a non-detergent or zinc-additive (ZDDP) oil
Babbitt bearings and flat-tappet camshafts require high zinc/phosphorus (ZDDP) content. Modern API-SN oils have reduced ZDDP and will accelerate wear on this engine. Use a dedicated classic car oil or add a ZDDP supplement.
- 3 Every 500–1,000 miles or each spring Inspect and adjust ignition points and timing
Points wear and drift on vintage ignition systems, causing hard starting, misfires, and poor performance. This is a 15-minute job that prevents most no-start calls.
- 4 Annually (spring) Flush and inspect cooling system; check all hoses and clamps
Original or aged rubber hoses crack from the inside out. A sudden hose failure will overheat and potentially seize the engine before you can pull over.
- 5 Every 500 miles or seasonally Lubricate all chassis grease fittings (zerks)
The V-63 chassis has numerous grease points on king pins, tie rod ends, and spring shackles. These will seize and score without regular grease.
- 6 Annually or before any extended drive Check and adjust mechanical brake linkage and cables
Four-wheel mechanical brakes require equal adjustment at all corners for straight, effective stops. Unequal adjustment causes severe brake pull — a real safety issue at any speed.
- 7 Monthly during storage; each spring Inspect and charge 6-volt battery
6-volt batteries self-discharge faster than modern 12-volt units and are damaged by deep discharge. A quality 6-volt maintainer (trickle charger) during storage is essential.
- 8 Before any storage longer than 30 days Drain fuel and add fuel stabilizer, or run carb dry before storage
Gasoline — especially ethanol-blended — varnishes carburetor jets and passages within weeks. A gummed carb is the single most common reason these cars won't start after sitting.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$800 – $5,000
Fuel
Ethanol-free premium gasoline; expect roughly 8–10 MPG in normal use. At current Wisconsin ethanol-free prices (~$4.50–$5.00/gal), budget $300–$600/year for typical show-season driving (500–1,000 miles).
Insurance
Agreed-value collector car insurance through a specialty carrier is strongly recommended — and typically very affordable (often $200–$600/year for a vehicle driven under 2,500 miles/year). Standard auto policies will not adequately cover a vehicle of this age and collector value.
Day-to-day running costs are low because this car will rarely be driven — but when something goes wrong, parts must often be machined or sourced from specialty vendors, and labor from a knowledgeable antique car mechanic is billed at a premium. Budget a dedicated restoration reserve on top of annual maintenance. A full engine rebuild (babbitt bearings, valve grind, etc.) can run $5,000–$15,000 at a specialty shop. Storage costs (heated, dry garage) are not optional in Wisconsin — salt air and freeze-thaw cycles will destroy an open Phaeton body.
Seasonal care
Lake Geneva, WI Winter
- Do NOT drive this vehicle in winter — road salt will rapidly destroy the chassis, body, and running gear. Store it from October through April at minimum.
- Store in a heated or at least dry, climate-stable garage. Freeze-thaw cycling causes wood body framing to crack and open coachwork fabric to deteriorate rapidly.
- Drain the cooling system completely or use a full-strength period-appropriate antifreeze mix — the original cooling system has limited freeze tolerance.
- Connect a 6-volt battery maintainer for the full storage period to prevent deep discharge and sulfation.
- Drain or stabilize fuel in the tank and run the carburetor dry before long-term storage to prevent varnishing.
- Place the car on jack stands to take weight off the tires and prevent flat-spotting during months of storage.
Summer
- Vapor lock is a real risk on hot days — carry a basic carburetor toolkit and know how to clear a flooded or vapor-locked carb before any extended drive.
- Monitor the temperature gauge (if fitted) or watch for steam closely; the cooling system has no pressure cap relief valve like modern systems — overheating can happen quickly and quietly.
- Check tire condition carefully before summer show season — antique bias-ply or reproduction tires degrade with age regardless of mileage; inspect sidewalls for cracking.
- The open Phaeton top provides no UV protection for the interior — use a quality indoor/outdoor car cover at shows to protect leather, fabric, and wood trim.
- Inspect all rubber fuel lines for heat-related softening or leaks before each drive — fuel leaks near a hot exhaust manifold are a fire hazard.
- Carry a basic toolkit (points, condenser, spare plugs, wrenches) on every drive — roadside assistance services are not equipped to handle a 1926 Cadillac.
Comparable vehicles
1926 Packard
Single Eight
Packard's straight-eight powered Single Eight was the direct luxury-market rival to Cadillac in the mid-1920s — similar price bracket, similar open coachwork options, and the same collector tier today.
No catalog match1926 Pierce-Arrow
Series 80
Pierce-Arrow was considered the pinnacle of American luxury in this era, with similar or greater coachwork quality and collectibility. Comparable restoration challenges and parts scarcity.
No catalog match1926 Lincoln
Model L
Ford's newly acquired Lincoln brand offered a competitive luxury V8 in the same market segment, now with Edsel Ford's styling influence. Surviving examples compete in the same show classes.
No catalog match1927 Chrysler
Series 70
The Chrysler Series 70 represented the upper tier of the new Chrysler brand — similar open touring and phaeton body styles, comparable displacement, and an interesting contrast to Cadillac's V8 with its inline-six.
No catalog match