Specifications, Part & Services, Museums & Clubs for Antique, Classic, Vintage and Muscle Cars

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1975 Buick Century Custom Series 4AH & 4AK
Coupe
Standard Specifications
  Show Summary  
Original Base Price $4,154.00
No. Produced 32,966
Body Maker Fisher
No. Doors 2
Passengers
Model Number 4AH57
Weight
Wheelbase 116 inches
Length 209.5 inches
Width 79 inches
Height 53.3 inches
Front Tread 61.1 inches
Rear Tread 59 inches
Type V6 overhead valve
Displacement 231 cu. in.
Cylinders 6
Bore & Stroke 3.8 & 3.4 inches
Compression Ratio-Std 8.0 to 1
Compression Ratio-Opt
Brake Horsepower 110@4000
Rated Horsepower 34.66
Torque 175@2000
Main Bearings
Valve Lifters Hydraulic
Block Material Cast Iron
Engine Numbers Same as VIN production number sequence.
Engine No. Location
Lubrication Pressure to all bearings excluding wrist pin
Type Dual downdraft
Make Rochester
Type Fully synchronized
Drive Rear wheel drive
No. Of Gears 3
Gear Ratios
1st 3.11 to 1
2nd 1.84
3rd 1 to 1
4th Not applicable
5th Not applicable
Reverse 3.22
Single plate dry disc
Clutch Size 9.125 inches
Semifloating
Hypoid
Differential Ratio 2.93 to 1
Front Independent ball joint with coil springs
Rear Coil link
Variable-ratio power
Service Front disc, rear self-adjusting drum
Front Size 11 inches
Rear Size 9.5 inches
Emergency Rear service brakes
Size 9.5 inches
Exhaust System Single
Ignition System Distributor and coil
Battery 12 volt storage battery
Cooling System Water pump
Radiator Cross flow
Fuel Type Unleaded
Mileage
Wheel Type
Wheel Mfr
Wheel Size
Tire Type
Tire Size GR78 x 15
Spare Location Trunk
Fuel 22 Gallons
Oil 4 Quarts
Transmission 3.5 Pints
Cooling System 15.35 Quarts
Rear Differential 2.9 Pints
Front Differential Not applicable
Transfer Case Not applicable
Not Rated
VIN/Serial no. 4H57C5-100001 and up
VIN Description Total Digits: 13
Digits 1: Make
Digits 2: Series
Digits 3-4: Body style
Digits 5: Engine
Digits 6: Model year
Digits 7: Assembly plant
Digits 8-13: Production number
VIN Location On plate on top of left side of dashboard, visible through windshield.
General VIN Decoder

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Additional Information
this model has a 112 inch wheelbase.

1975 Buick Chassis Service ManualLos Angeles Public Library
630 West Fifth Street
Los Angeles CA 90071
(213) 228-7000
www.lapl.org
The Buick - A Complete History by Dunham Gusten & Stf of Auto. QuarterlyHorseless Carriage Foundation
8186 Center St. Suite F P.O. Box 4119
La Mesa CA 91944-4119
(619) 464-0301
www.hcfi.org
Serial No. Book for US Cars 1900-1975 G. BrighamHorseless Carriage Foundation
Ward's Automotive Yearbook for 1975Detroit Public Library (Nat'l Auto. Hist. Collctn)
5201 Woodward
Detroit MI 48202
(313) 833-1456
www.detroit.lib.mi.us/nahc/index.htm
Motor Age December 1974Detroit Public Library (Nat'l Auto. Hist. Collctn)
Automotive News (1975 Almanac Issue)Detroit Public Library (Nat'l Auto. Hist. Collctn)
Paint Type
Colors Regal Black
Arctic White
Sandstone
Silver Mist Metallic
Dove Gray
Pewter Metallic
Antique Silver Metallic
Horizon Blue Metallic
Glacier Blue
Majestic Blue Metallic
Blue Haze Metallic
Indigo Metallic
Ranch Green
Verde Mist Metallic
Sand Beige
Canary Yellow
Walnut Mist Metallic
Honey Gold Metallic
Almond Mist Metallic
Golden Tan Metallic
Bittersweet Metallic
Ruby Red
Burgundy Metallic
Apple Red
Rhone Red Metallic
Pumpkin Metallic
All colors may not be available in all models.
Standard/Optional Equipment
350 cu. in. V8 engineOpt
Power windowsOpt
Air conditioningOpt
Power brakesOpt
Power seatsOpt
RadioOpt
Speed control deviceOpt
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