Cadillac’s 75th anniversary year arrived with a shock to traditionalists, as full-size models endured an eye-opening downsizing. “You must drive it,” the ads declared, “to see why we call it the next generation of the luxury car.” The new C-bodied DeVille, Brougham and limousine were 8 to 12 in. shorter, 3-1/2 in. narrower, and an average of 950 pounds lighter than their massive predecessors. Still, many models managed to keep the same leg room in front and rear (or even more). Only Eldorado carried on in its mammoth form a while longer, and Seville had entered life in 1975 with contemporary dimensions. Even the commercial chassis shrunk, from 157.5 down to 144.5 inches in wheelbase, requiring funeral car and ambulance suppliers to create some new bodies.
All models except Seville carried a new lighter, smaller 425 cu. in. (7.0-liter) V-8 engine. That powerplant emerged as the result of testing 110 experimental engines. The huge 500 V-8 was gone. Electronic fuel injection was optional in DeVille, Brougham, and Eldorado. Standard Turbo Hydra-matic fed power to low-ratio drive axles. Four-wheel disc brakes were standard on Seville, Eldorado and Brougham. Astroroofs and sunroofs were again available. Carryover special editions included Coupe and Sedan DeVille d’Elegance and Brougham ‘Elegance.
One new special edition joined the lineup: the Eldorado Custom Biarritz. All sedans now had pillars and framed door glass. (The ‘true’ four-door hardtop was gone for good.) With Calais departed, DeVille took over as the cheapest Caddy (base price under $10,000). Dash gauges could be pulled out from the front for servicing. All models had a new two-spoke steering wheel — but those were wide spokes. A new door design offered better hold-open qualities. Anti-corrosion treatment on all models included zinc-rich primers, hot melt sealers, wax coating, Plastisol-R-, and deadeners. Cadillac also expanded the use of Zincrometal-R- and bi-metal (stainless steel on aluminum), corrosion-resistant inner front fender panels, and elimination of areas that trapped dirt and water. Wheels and tires were now match-mounted for smoothest ride.
All Cadillacs again had a 13-symbol Vehicle Identification Number (VIN) on the forward lower edge of the windshield frame, visible through the windshield.
The first digit (“6”) identifies the Cadillac Division.
The second symbol denotes car line/series:
“S” Seville
“D” DeVille
“B” Fleetwood Brougham
“F” Fleetwood limousine
“L” Eldorado
“Z” commercial chassis
Digits three and four indicate body type:
“23” 4-door limousine with auxiliary seat
“33” 4-door formal limousine with partition window
“47” 2-door coupe
“69” 4-door pillared sedan
“90” commercial chassis (number identifies name of body builder)
Next comes the engine code:
“R” V8-350 EFI
“S” V8-425 4 Bbl.
“T” V8-425 EFI
Symbol six indicates model year (“7” 1977).
Seventh is an assembly plant code:
“Q” Detroit
“E” Linden, NJ
At the end is a six-digit sequence number:
running from 100001 to 400000 for C-bodies and Eldos built in Detroit
running from 450001 to 550000 for Sevilles from Detroit
running from 600001 to 690000 for C-bodies built in Linden
A nine-digit derivative of the VIN appears on the engine.
A Body Number Plate has codes for model year, model number, trim combination, body number (assembly plant and sequence built), paint color(s), and a number-letter code that shows the date built.
That plate is mounted on the upper left cowl between hood rear seal and windshield except Eldorado, on left side of cowl next to hood rear bumper; and Seville, riveted to cowl above evaporator case.
SPECIFICATIONS
FLUID CAPACITIES
Engine
V8 350cc (5.7L)
V8 425cc (7.0L)
Crankcase
4 qt
4 or 5 qt
Crankcase with new filter
5 qt
5 or 6 qt
AutomaticTransmission after draining
8 pt
8 or 10 pt
Drive Axle
5 pt
5 or 4 pt
Fuel tank
21 gal(US)
24.5 or 27.5 gal(US)
Cooling with heater
17.2 qt
21 or 26 qt
Cooling with A/C
17.2 qt
21 or 26 qt
Heavy duty Cooling
NA
NA qt
GASOLINE ENGINE TUNE-UP SPECS
Engine V.I.N Code
R
S
T
Engine type
V8-350cc(5.7L)
V8-425cc(7.0L)
V8-425cc(7.0L)
Fuel delivery
4 bbl
4 bbl
EFI
Manufacturer
Oldsmobile
Cadillac
Cadillac
Original Spark plug
R47SX
R45NSX
R45NSX
Gap
0.060 in.
0.060 in
0.060 in
Distributor
Electronic
Electronic
Electronic
Ignition timing (BTDC)
10° (6°)
10°@1400 rpm
18°@1400 rpm
Intake valve opens (BTDC)
22
21
21
Fuel pump pressure
5¼ to 6½ psi
5¼ to 6½ psi
39 min.
Idle speed
650 rpm
675 rpm
675 rpm
ALTERNATOR AND REGULATOR SPECS
Part #
1102380
1101023
1101033
1117152
Field current @ 12 V
4 – 4.5
4 – 4.5
4 – 4.5
4 – 4.5
Output
63 amps
80 amps
80 amps
145 amps
Regulator
Solid state
Solid state
Solid state
Solid state
Volts @ 75°
13.8 – 14.8
13.8 – 14.8
13.8 – 14.8
13.8 – 14.8
BATTERY AND STARTER SPECS
Engine
V8-350cc (5.7L)
V8-425cc (7.0L)
Battery Ampere Hour Capacity
3500 watts cranking power @ 0°F
Battery Volts
12
12
Battery Terminal Grounded
Neg.
Neg.
Starter, Lock Test, Amps
Not Recommended
Not Recommended
Starter, Lock Test, Volts
Starter, Lock Test, Torque
Starter, No-Lead Test, Amps
65 – 95
65 – 95
Starter, No-Lead Test, Volts
9
9
Starter, No-Lead Test, RPM
7000 – 10500
7000 – 10500
Starter, Brush Spring Tension
35 oz. min.
35 oz. min.
GENERAL ENGINE SPECS
Engine V.I.N Code
R
S
T
Engine type
V8-350cc(5.7L)
V8-425cc(7.0L)
V8-425cc(7.0L)
Manufacturer
Oldsmobile
Cadillac
Cadillac
Fuel delivery
EFI
4 bbl
EFI
Horsepower
180@4400
180@3600
215@3600
Torque
275@2000
260@2000
260@2000
Bore x Stoke
4.057 x 3.385
4.082 x 4.060
4.082 x 4.060
Compression Ratio
8.00:1
8.50:1
8.50:1
Oil pressure
35 psi
35 psi
35 psi
CRANKSHAFT SPECS
Engine type
V8-350cc(5.7L)
V8-425cc(7.0L)
Main Brg Journal Dia.
2.4985 – 2.4995 (No. 1 2.4988 – 2.4998 in)
3.250
Main Brg Oil Clearance
0.0005 – 0.0021 (No. 5 0.0015 – 0.0031in)
0.0001 – 0.0026
Shaft End-play
0.004 – 0.014
0.002 – 0.012
Thrust on No.
3
3
CONNECTING ROD SPECS
Engine type
V8-350cc(5.7L)
V8-425cc(7.0L)
Journal Dia.
2.1238 – 2.1248
2.5000
Oil Clearance
0.0004 – 0.0033
0.0005 – 0.0028
Side Clearance
0.006 – 0.020
0.008 – 0.020
PISTON AND RING SPECS
Engine type
V8-350cc(5.7L)
V8-350cc(5.7L) Diesel
V8-425cc(7.0L)
Piston-Bore Clearance
0.0010 – 0.0020
0.0005 – 0.0006
0.0006 – 0.0014
Ring Side Clearance: Top Compression
0.0020 – 0.0040
0.005 – 0.007
0.0017 – 0.0040
Ring Side Clearance: Bottom Compression
0.0020 – 0.0040
0.0018 – 0.0038
0.0017 – 0.0040
Ring Side Clearance: Oil Control
0.0006 – 0.0098
0.0078 max.
None (side sealing)
Ring Gap: Top Compression
0.010 – 0.023
0.015 – 0.025
0.013 – 0.023
Ring Gap: Bottom Compression
0.010 – 0.023
0.015 – 0.025
0.013 – 0.023
Ring Gap: Oil Control
0.015 – 0.055
0.015 – 0.055
0.015 – 0.055
VALVE SPECS
Engine type
V8-350cc(5.7L)
V8-350cc(5.7L) Diesel
V8-425cc(7.0L)
Seat Angle
31°(exh)
45°(intake); 31° (exhaust)
45°
Face Angle
30° (exh)
44°(intake); 30° (exhaust)
44° (exh)
Spring Test Pressure
187 lb @ 1.27 in.
151 lb @ 1.30 in.
160 lb @ 1.50 in.
Spring Installed Height
1-43/64″
1-43/64″
115⁄16 in.
Stem-to-Guide Clearance: Intake
0.0010 – 0.0027
0.0010 – 0.0027
0.0010 – 0.0027
Stem-to-Guide Clearance: Exhaust
0.0015 – 0.0032
0.0015 – 0.0032
0.0010 – 0.0027
Stem Diameter: Intake
0.3429
0.3429
0.3416
Stem Diameter: Exhaust
0.3424
0.3424
0.3416
TORQUE SPECS
Engine type
V8-350cc(5.7L)
V8-350cc(5.7L) Diesel
V8-425cc(7.0L)
Cyl. Head Bolts
130 ft.lb
130 ft. lb
90 ft. lb
Rod Brg Bolts
42 ft.lb
42 ft. lb
40 ft. lb
Main Brg Bolts
80 ft.lb (120 on # 5)
120 ft. lb
90 ft. lb
Crankshaft Damper or Pulley Bolt
310 ft.lb
200 – 310 ft.lb
Press fit
Flywheel to Crankshaft Bolts
60 ft.lb
60 ft. lb
75 ft. lb
Intake Manifold
40 ft.lb
40 ft. lb
30 ft. lb
Exhaust Manifold
25 ft.lb
25 ft. lb
22 ft. lb
CARBURETOR SPECS
Carb ID
17057232 (M4ME)
17057233 (M4ME)
17057230 (M4ME)
17057231 (M4ME)
17057530 (M4ME)
17057533 (M4ME)
Float Level
13/32 in
13/32 in
13/32 in
17/32 in
13/32 in
13/32 in
Air Valve Spring
1/2 turn
1/2 turn
1/2 turn
1/2 turn
1/2 turn
1/2 turn
Pump Rod
3/8 in
3/8 in
7/16 in
3/8 in
7/16 in
7/16 in
Primary Vacuum Break
0.140 in
0.140 in
0.140 in
0.140 in
0.150 in
0.150 in
Secondary Vacuum Break
0.140in
0.140in
0.140 in
0.140in
0.150in
0.150 in
Choke Rod
0.080 in
0.080 in
0.080 in
0.080 in
0.080 in
0.080 in
Choke Unloader
0.230 in
0.230 in
0.230 in
0.230 in
0.230 in
0.230 in
Fast Idle Speed
1400 rpm
1400 rpm
1400 rpm
1400 rpm
1500 rpm
1500 rpm
WHEEL ALIGNMENT SPECS
Feature
Eldorado
Full size
Seville
Caster Range
1°N – 1°P
2°P – 4°P
1°P – 3°P
Caster Pref.
0°
3°P
2°P
Camber LH wheel Range
¾°N – ¾°P
¼°N – 1¼°P
¾°N – ¾°P
Camber LH wheel Pref.
0°
½°
0°
Camber RH wheel Range
¾°N – ¾°P
¼°N – 1¼°P
¾°N – ¾°P
Camber RH wheel Pref.
0°
½°
0°
Toe-In
0″
0″
1/16″
Steering Axis Inclination
6°
10-19/32°
10-5/8°
HISTORICAL NOTES
1977 Cadillac Notes
Introduced: September 23, 1976.
Model year production (U.S.): 358,487 for a 3.9 percent share of the industry total.
Calendar year production (U.S.): 369,254.
Calendar year sales by U.S. dealers: 335,785 for a 3.7 percent market share.
Model year sales by U.S. dealers: 328,129.
Edward C. Kennard was general manager
Robert J. Templin was chief engineer
Wayne Kady was chief designer (Cadillac Studio)
F. T. Hopkins was general sales manager
Cadillac executives didn’t appreciate Ford’s advertising claim that an LTD was now as good as a Cadillac.
But the new smaller Caddies were selling well, at least at the beginning.
Sales of 328,129 units scored 9.5 percent over the 1976 record.
Model year production also beat the 1976 score, by 16 percent.
Rumors early in the year suggested that Cadillacs might be “upsized” within a couple of years; but that didn’t seem likely in view of the need to meet stricter Corporate Average Fuel Economy (CAFE) requirements.
Now that the Fleetwood Seventy-Five was gone, conversion companies stepped up production of “stretch” limousines.
Moloney Coachbuilders (in Illinois) offered a 40-inch stretch of Brougham for under $15,000 (plus the cost of the car, of course).
Phaeton Coach Corp. of Dallas, and the California-based American Custom Coach-works did similar work.
The latter also created custom convertibles based on the Coupe DeVille chassis, while an Ohio firm (Convertibles, Inc.) turned out ragtop Eldorado conversions.
Cadillac production figures
Sedan de Ville95,421 (increased 27,744)
Coupe de Ville138,750 (increased 24,268)
Eldorado47,344 (decreased 1,840)
Seville45,060 (increased 1,288)
Series 6028,000 (increased 3,500)
Series 753,913 (increased 589)
1977 Automotive Notes
Imported-car sales reach two million
President Carter appoints Joan Claybrook (colleague of Ralph Nader) as head of the National Traffic Safety Administration
US Dept. of Transportation says all cars beginning 1982 must have air bags
GM news:
Elliott M. Estes was president of GM
Thomas A. Murphy was chairman of the board at GM
Chevrolet outsells Ford by over 700,000 followed by Oldsmobile, Pontiac, and Buick
Chevrolet adds compact Concours as an upmarket Nova
Full-size Buick gets a new 403-cid V-8 (6.6 litre) option
Cadillac gets a more efficient 425-cid V-8 (7 litre) engine
Vega’s poor reputation results in few sales and is removed from lineup
Monza is similar to Vega and remains for a few more years
Mid-year Camaro Z28 has less power than early 1970’s but still sells well
Oldsmobile’s 455-cid V-8 (7.4 litre) is replaced with a 403-cid V-8 (6.6 litre)
Mid-season Pontiac introduces Phoenix based on the Ventura
Pontiac’s 2.5-litre “Iron Duke” four-cylinder engines goes into Astre, Sunbird, Phoenix, Ventura and other GM models
Mid-year Pontiac brings out a “Cam Am” a Cameo White Le Mans Sport Coupe with T/A 4.03-cid V-8 (6.6 litre) Rally handling package, special trim, etc.
Ford news:
Mid-size Torino is now LTD II
New Thunderbird built on mid-size LTD II platform to replace Ford Elite
Lincoln introduces the Versailles as an upscale Granada/Monarch to compete with Cadillac Seville
Lincoln introduces Continental Mark V which is lighter than the Mark IV and sells better
Cougar name replaces Montego for all mid-size coupes, sedans, and wagons
Chrysler news:
Plymouth sales in sixth place, but Dodge moves up from eighth to seventh
Chrysler introduces mid-size LeBaron and Diplomat based on the compact Aspen/Volare
In Canada, Plymouth offers a Diplomat clone called Caravelle
Full-size Monaco is called Royal Monaco; mid-size cars are now Monaco
AMC news:
Gremlin gets a new eggcrate grille and an Audi-designed 4-cylinder engine