Eldorado Cadillac History1978

Eldorado Cadillac Models & History 1978

While waiting one more year for an all-new downsized body, Eldorado received no major change other than a revised crosshatch grille dominated by heavier horizontal bars. Also noteworthy on the outside was the padded Elk grain vinyl top. The four-row peaked checkerboard grille was flanked by quad rectangular headlamps. Amber parking lamps sat low on the bumper. The grille pattern was repeated between license plate and bumper guards, below the protruding protective strip. Massive chrome vertical bumper ends extended upward to form housings for auxiliary lamps, forming a huge bright extension of fender tips. Eldorado block letters stood above the upper grille bar, which tapered outward above the headlamps.

1978 Cadillac Eldorado

Standard engine was the 425 cu. in. (7.0-liter) V-8, available with carburetor or fuel injection. Eldorados had

  • four-wheel disc brakes
  • front-wheel drive
  • electronic level control
  • automatic climate control
  • power windows and door locks
  • cornering lights
  • six-way power seat
  • three-speed wipers
  • Freedom battery
  • lamp monitors
  • a trip odometer
  • wide-whitewall steel-belted radial tires
  • Soft-Ray tinted glass
  • accent striping
  • remote control left-hand mirror
  • color-keyed litter container
  • vanity mirror
  • lighters
  • bumper impact strips
  • a stowaway spare tire

Interiors might be Halifax knit in four colors, Random velour in choice of three, or a dozen Sierra Grain leather combinations. Dramatic two-tones were also available on Dual Comfort front seats, in three color combinations. Option included

  • a 40-channel CB
  • 8-track tape player
  • Astroroof
  • sun roof

1978 Cadillac Eldorado

Eldorado Biarritz, which first appeared during the 1976 model year, now sported a convertible-like padded vinyl top, unique scripts, accent stripes, and distinctive chrome body moldings. Inside the Custom Biarritz were Sierra Grain leather contoured pillow-style seats in antique medium saddle, white, dark carmine, antique yellow, or antique light blue. The Cabriolet roof accented Eldo’s distinctively-shaped quarter windows that tapered downward at the front, with a vinyl-insert molding across the fully padded Elk Grain vinyl top. Black-accented brushed stainless steel belt moldings stretched from rear to hood, terminating in a spearlike design at the front. Special stripes accented front fenders, doors, and rear quarter panels. Biarritz came in five colors: Mediterranean Blue Firemist, Cotillion White, Carmine Red, Colonial Yellow, and Ruidoso Saddle. All had opera lamps, remote-control passenger-side mirror, and color-coordinated wheel discs. Customers also had the choice of a Custom Biarritz Classic, with two-tone paint scheme that not everyone found attractive.


Model No. Style Number Body Type Seating Factory Price Shipping Weight Production Total
6E L47 2-door Coupe 6 $11,921 4906 46,816


Feature Base engine Optional fuel injected engine Optional diesel engine
Type 90-degree, overhead valve V-8. Cast iron block and head
Displacement 425 cu. in. (7.0 liters) 350 cu. in. (5.7 liters)
Bore & stroke 4.082 x 4.06 in. 4.057 x 3.385 in.
Compression ratio 8.2:1 22.5:1
Brake horsepower 180 @ 4000 rpm 195 @ 3800 rpm 120 @ 3600 rpm
Torque 320 lbs.-ft. @ 2000 rpm 320 @ 2400 rpm 220 lbs.-ft. @ 1600 rpm
Main bearings Five
Valve lifters Hydraulic
Fuel supply 4 Bbl. carburetor electronic fuel injection Electronic fuel injection
VIN Code S T N


Wheelbase 126.3″
Overall length 224.0″
Height 54.2″
Width 79.8″
Front Tread 63.7″
Rear Tread 63.6″
Standard Tires LR78 x 15-B


Transmission Turbo Hydra-matic transmission standard on all models; column shift.
Gear ratios (1st) 2.48:1: (2nd) 1.48:1; (3rd) 1.00:1; (Rev) 2.07:1.
Standard axle ratio 2.73:1 except high-alt. 3.07:1.
Rear Axle Spiral bevel rear axle
Steering variable-ratio, power assisted
Front suspension upper/lower control arms, torsion bars
Rear suspension four-link drive, coil springs
Brakes four-wheel disc.
Ignition HEI electronic ignition.
Fuel tank 27 gal.


Heavy-duty cooling system $41
80-amp alternator $51
Engine block heater $20
California emission equipment $75
High altitude pkg. $33


Eldorado Cabriolet $484
Eldorado Cabriolet w/Astroroof $1565
Eldorado Cabriolet w/sunroof $1365
Eldorado Custom Biarritz $1865
Eldorado Custom Biarritz w/Astroroof $2946
Eldorado Custom Biarritz w/Sunroof $2746
Eldorado Custom Biarritz Classic $2466
Eldorado Custom Biarritz Classic w/Astroroof $3547
Eldorado Custom Biarritz Classic w/Sunroof $3347


Astroroof w/full vinyl roof $995
Astroroof (painted $1106
Sunroof w/full vinyl roof $795
Sunroof (painted roof $906
Cruise control $122
Controlled-cycle wipers $32
Rear defogger, grid-type $94
Six-way Dual Comfort power passenger seat adjuster $118-$150
Power 50/50 seat recliner $116
Power 50/50 passenger seat recliner $210-$262
Tilt/telescope steering wheel $121
Automatic door locks $114
Illuminated entry system $59
Fuel monitor $29
Theft deterrent system $130
Trunk lid release and power pull-down $80
Twilight Sentinel $54
Guidematic headlamp control $62
Trumpet horn $21
Remote-control right mirror $34
Lighted thermometer on left mirror $27
Lighted vanity mirror, passenger $50
AM/FM stereo radio with digital display; $106
AM/FM stereo radio with digital display w/tape player $106
AM/FM stereo radio with digital display w/CB $281
AM/FM stereo radio with digital display w/tape and CB $427
Firemist paint $163
Door edge guards $11-$18
License frame (each) $9
Dual Comfort 50/50 front seats $198
Leather seating area w/two-tone and 50/50 dual comfort front seats $556
Carpeted rubber front floor mats $31-$34
Carpeted rubber rear floor mats $15-$21
Trunk mat $12
Locking wire wheels $541-$595
Locking wire wheel covers $179-$233