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1968 Cadillac

1968 Cadillac

The 1968 spotlight was on motive power: an all-new 7.7 Liter V-8 with 375 bhp. Designed to meet the new government emission standards that took effect that year, it was extensively tested in the laboratory, being run the equivalent of 500,000 miles. Though not as fuel-efficient as its predecessor, the 7.7 Liter could boast of being the largest production engine offered in the industry. Designwise, the '68 Eldorado gained the federally required side marker lights, plus larger taillights, combined turn signal/parking lamps nested in the front-fender caps, and a hood extended at the rear to conceal the windshield wipers. Standards also got the hidden wipers and side markers, along with a revised grille.

I. D. NUMBERS

  • Vehicle identification numbers were stamped on the top of the instrument panel this year and were visible through the windshield
  • The original engine serial number was the same as the vehicle identification number
  • The first symbol was a number "6" to indicate "Cadillac"
  • The second and third symbol represented the series code number
    • "82" for Calais
    • "83" for DeVille
    • "93" for Eldorado
    • "80" for Fleetwood 60 Special
    • "81" for Fleetwood 60 Brougham
    • "97" for Fleetwood 75 Limousine
    • "98" for Commercial chassis
  • The fourth and fifth symbol represented the Fisher Body Division Code
    • 23 = 4-dr luxury sedan
    • 33 = 4-dr limo sedan
    • 47 = 2-dr hardtop coupe
    • 49 = 4-dr hardtop sedan
    • 67 = 2-dr convertible
    • 69 = 4-dr sedan
    • 90 = commerical chassis
  • The sixth symbol was a number "8" for 1968 model year
  • The seventh symbol was a letter to represent the assembly plant
    • Q = Detroit, Michigan
    • E = Linden, New Jersey
  • The next six numbers beginning with 100001 at each assembly plant was the sequential serial number

SPECIFICATIONS

FLUID CAPACITIES

EngineV8 472cc (7.7L)
Crankcase4 or 5 qt
Crankcase with new filter5 or 6 qt
AutomaticTransmission after draining25 or 26 pt
Drive Axle5 or 4.5 pt
Fuel tank26 gal(US)
Cooling with heater21 qt
Cooling with A/C21 qt
Heavy duty Cooling25 qt

GASOLINE ENGINE TUNE-UP SPECS

Engine V.I.N CodeNA
Engine typeV8-472cc(7.7L)
Fuel delivery4 bbl
ManufacturerCadillac
Original Spark plug44N
Gap0.035 in.
Distributor Point dwell30°
Distributor Point gap0.016 in.
Ignition timing (BTDC)5°
Intake valve opens (BTDC)18°
Fuel pump pressure5¾ psi
Idle speed550 rpm

ALTERNATOR AND REGULATOR SPECS

Part #110069611006941100742 
Field current @ 12 V2.2 - 2.62.2 - 2.62.2 - 2.6 
Output42 amps55 amps63 amps130 amps
Regulator Field-Relay: Air Gap0.015 in.0.015 in.0.015 in.Transistor-
Type
Regulator Field-Relay: Point Gap0.030 in.0.030 in.0.030 in.
Regulator Field-Relay: Volts to Close1.5 - 3.21.5 - 3.21.5 - 3.2
Regulator Air Gap0.060 in.0.060 in.0.060 in.
Regulator Point Gap0.014 in.0.014 in.0.014 in.
Regulator Volts @ 75°13.5 - 14.413.5 - 14.413.5 - 14.413.5 - 14.4

BATTERY AND STARTER SPECS

EngineV8-472cc (7.7L)
Battery Ampere Hour Capacity74
Battery Volts12
Battery Terminal GroundedNeg.
Starter, Lock Test, AmpsNot Recommended
Starter, Lock Test, Volts
Starter, Lock Test, Torque
Starter, No-Lead Test, Amps70 - 99
Starter, No-Lead Test, Volts9
Starter, No-Lead Test, RPM7800
Starter, Brush Spring Tension35 oz. min.

GENERAL ENGINE SPECS

Engine V.I.N Code 
Engine typeV8-472cc(7.7L)
ManufacturerCadillac
Fuel delivery4 bbl
Horsepower375@4400
Torque525@3000
Bore x Stoke4.300 in. x 4.060 in.
Compression Ratio10.5:1
Oil pressure33 psi

CRANKSHAFT SPECS

Engine typeV8-472cc(7.7L)
Main Brg Journal Dia.3.250 in.
Main Brg Oil Clearance0.0003 in. - 0.0026 in.
Shaft End-play0.002 in. - 0.012 in.
Thrust on No.3

CONNECTING ROD SPECS

Engine typeV8-472cc(7.7L)
Journal Dia.2.5000 in.
Oil Clearance0.0005 in. - 0.0028 in.
Side Clearance0.008 in. - 0.016 in.

PISTON AND RING SPECS

Engine typeV8-472cc(7.7L)
Piston-Bore Clearance0.0006 in. - 0.0010 in.
Ring Side Clearance: Top Compression0.0017 in. - 0.0040 in.
Ring Side Clearance: Bottom Compression0.0017 in. - 0.0040 in.
Ring Side Clearance: Oil ControlNone (side sealing)
Ring Gap: Top Compression0.013 in. - 0.025 in.
Ring Gap: Bottom Compression0.013 in. - 0.025 in.
Ring Gap: Oil Control0.015 in. - 0.055 in.

VALVE SPECS

Engine typeV8-472cc(7.7L)
Seat Angle45°
Face Angle45°
Spring Test Pressure160 lb @ 1.50 in.
Spring Installed Height115⁄16 inches (1.671875 in.)
Stem-to-Guide Clearance: Intake0.0005 in. - 0.0025 in.
Stem-to-Guide Clearance: Exhaust0.0010 in. - 0.0025 in.
Stem Diameter: Intake0.3415 in. - 0.3425 in.
Stem Diameter: Exhaust0.3415 in. - 0.3420 in.

TORQUE SPECS

Engine typeV8-472cc(7.7L)
Cyl. Head Bolts115 ft.lb
Rod Brg Bolts40 ft.lb
Main Brg Bolts90 ft.lb
Crankshaft Damper or Pulley BoltPress fit
Flywheel to Crankshaft Bolts75 ft.lb
Intake Manifold30 ft.lb
Exhaust Manifold35 ft.lb

CARBURETOR SPECS

Carb ID7016932 (4MV)7016930 (4MV)
Float Level11⁄32 in.1⁄4 in
Pump Rod11⁄32 in11⁄32 in
Choke Unloader0.312 in0.312 in
Fast Idle Speed1925 rpm1925 rpm

WHEEL ALIGNMENT SPECS

FeatureEldoradoFull size
Caster Range1½°N - 2½°N1½°N - ½°N
Caster Pref.2°N1°N
Camber LH wheel Range3⁄8°N - 3⁄8°P3⁄8°P - 1⁄8°N
Camber LH wheel Pref.0°0°
Camber RH wheel Range3⁄8°N - 3⁄8°P1⁄8°P - 3⁄8°N
Camber RH wheel Pref.0°¼°N
Toe-In0 - 1⁄8 in.3⁄16 in. - 1⁄4 in.
Steering Axis Inclination11°6°

HISTORICAL NOTES

1968 Cadillac Notes

  • Dealer introduction for 1968 Cadillacs and Eldorados took place September 21, 1967.
  • Fourth successive yearly sales record set this year despite 21 day UAW shutdown at Fisher Body Fleetwood plant in Detroit (November 1967)
  • Production was down 1.1 percent, due to same strike.
  • Four-wheel disc brakes with floating calipers optionally available.
  • All-new dash-board design.
  • Cadillac's new engine designed to meet tougher emissions regulations
  • Larger, shrouded rear view mirrors to eliminate wind buffeting.
  • Calvin J. Werner was general manager
  • Carl A. Rasmussen was chief engineer
  • Stanley Parker was chief designer (Cadillac Studio) until April
  • Stanley Wilen became chief designer (Cadillac Studio) in April
  • F. T. Hopkins was general sales manager
  • Cadillac production figures
Calais18,190 (decreased 3,640)
Sedan de Ville82,512 (increased 20,810)
Coupe de Ville63,935 (increased 11,030)
de Ville convertible18,025 (decreased 175)
Eldorado24,528 (increased 6,598)
Series 6018,600 (increased 2,300)
Series 754,213 (increased 80)