1951 BUICK
Models:
Buick Special, Series 40, 8 Cylinder
Buick Super, Series 50, 8 Cylinder
Buick Roadmaster, Series 70, 8 Cylinder
Buick Special, Series 40, 8 Cylinder:
Body Data & Pricing:
Standard Models:
4 Door Sedan, 6 Passenger, Model 41, Body #51-4367
Base Price: $2,139; Shipping Weight: 3,605 Pounds; Production Total: 999
2 Door Sport Coupe, 6 Passenger, Model 46S, Body #51-4327
Base Price: $2,046; Shipping Weight: 3,600 Pounds; Production Total: 2,700
DeLuxe Models:
4 Door Sedan, 6 Passenger, Model 41D, Body #51-4369
Base Price: $2,185; Shipping Weight: 3,680 Pounds; Production Total: 87,848
2 Door Sedan, 6 Passenger, Model 48D, Body #51-4311D
Base Price: $2,127; Shipping Weight: 3,615 Pounds; Production Total: 54,311
2 Door Hardtop Coupe, 6 Passenger, Model 46, Body #51-4337
Base Price: $2,225; Shipping Weight: 3,645 Pounds; Production Total: 16,491
2 Door Convertible Coupe, 6 Passenger, Model 46C, Body #51-4367X
Base Price: $2,561; Shipping Weight: 3,830 Pounds; Production Total: 2,099
Total Series Production: 164,448.
Buick Super, Series 50, 8 Cylinder
Body Data & Pricing:
4 Door Sedan, 6 Passenger, Model 51, Body #51-4569
Base Price: $2,356; Shipping Weight: 3,755 Pounds; Production Total: 10,000
2 Door Sedanette, 6 Passenger, Model 56S, Body #51-4507
Base Price: $2,248; Shipping Weight: 3,685 Pounds; Production Total: 1,500
2 Door Hardtop Coupe, 6 Passenger, Model 56R, Body #51-4537
Base Price: $2,356; Shipping Weight: 3,765 Pounds; Production Total: 54,512
2 Door Convertible Coupe, 6 Passenger, Model 56C, Body #51-4567X
Base Price: $2,728; Shipping Weight: 3,965 Pounds; Production Total: 8,116
4 Door Station Wagon, 6 Passenger, Model 59, Body #(Ionia)
Base Price: $3,133; Shipping Weight: 4,100 Pounds; Production Total: 2,212
4 Door Sedan, 6 Passenger, Model 52, Body #51-4519
Base Price: $2,563; Shipping Weight: 3,825 Pounds; Production Total: 92,886
Total Series Production: 169,226.
Buick Roadmaster, Series 70, 8 Cylinder
Body Data & Pricing:
2 Door Hardtop, 6 Passenger, Model 76R, Body #51-4737X
Base Price: $3,143; Shipping Weight: 4,235 Pounds; Production Total: 12,901
2 Door Hardtop, 6 Passenger, Model 56MR, Body #51-4737
Base Price: $3,051; Shipping Weight: 4,185 Pounds; Production Total: 809
2 Door Convertible Coupe, 6 Passenger, Model 76C, Body #51-4767X
Base Price: $3,453; Shipping Weight: 4,395 Pounds; Production Total: 2,911
4 Door Station Wagon, 6 Passenger, Model 79R, Body #(Ionia)
Base Price: $3,977; Shipping Weight: 4,505 Pounds; Production Total: 679
4 Door Sedan, 6 Passenger, Model 72R, Body #51-4719X
Base Price: $3,200; Shipping Weight: 4,285 Pounds; Production Total: 48,758
Total Series Production: 66,058
All Series: X in Serial Number Denotes Hydralic Seat & Window Controls
Major Specifications, Buick Special, Model 40:
Wheelbase: 121-1/2"
Engine Type: Overhead Valve In-Line 8 Cylinder
Engine Bore & Stroke: 3-3/16" X 4-1/8"
Engine Displacement: 263.3 Cu. In.
Taxable Horsepower: 32.51
Compression Ratio:
Manual Transmission: 6.60:1
Dynaflow Transmission: 7.20:1
Horsepower:
Manual Transmission: 120 @ 3,600 RPM
Dynaflow Transmission: 128 @ 3,600 RPM
Torque:
Manual Transmission: 215 Ft. Lbs. @ 2,000 RPM
Dynaflow Transmission: 225 Ft. Lbs. @ 2,000 RPM
Normal Oil Pressure: 35 PSI
Carburetor: Carter, Model 725, 822 2 Barrel; or Stromberg Model AAUVB-267, #380258
Rear Axle Ratio: Not Available
Tire Size: 7.00 X 15 Inches
Major Specifications, Buick Super, Series 50
Wheelbase: 121-1/2" (Model 52: 125'1/2")
Engine Type: Overhead Valve In-Line 8 Cylinder
Engine Bore & Stroke: 3-3/16" X 4-1/8"
Engine Displacement: 263.3 Cu. In.
Compression Ratio:
With Manual Tansmission: 6.90:1
With Dynaflow Transmission: 7.20:1
Taxable Horsepower: 32.51
Horsepower:
With Manual Transmission: 124 @ 3,600 RPM
With Dynaflow Transmission: 128 @ 3,600 RPM
Torque:
With Manual Transmission: 220 Ft. Lbs. @ 2,000 RPM
With Dynaflow Transmission: 225 Ft. Lbs. @ 2,000 RPM
Normal Oil Pressure: 35 PSI
Carburetor: Carter, Model 725, 822 2 Barrel; or Stromberg Model AAUVB-267, #380258
Rear Axle Ratio: Not Available
Tire Size: 7.00 X 15 Inches
Major Specifications, Buick Roadmaster, Model 70
Wheelbase: 126-1/4" (Model 72: 130-3/4")
Engine Type: Overhead Valve In-Line 8 Cylinder
Engine Bore & Stroke: 3-7/16" X 4-5/16"
Engine Displacement: 320.2 Cu. In.
Compression Ratio: 7.50:1
Taxable Horsepower: 37.81
Horsepower: 170 @ 3,800 RPM
Torque: 280 Ft. Lbs. @ 2,400 RPM
Normal Oil Pressure: 35 PSI
Carburetor: Stromberg AAVB267, or Carter Model 726, 2 Barrel
Rear Axle Ratio: Not Available
Tire Size: 8.00 X 15 Inches
Capacities, Buick Special, Model 40 & Super, Model 50:
Cooling System:
Without Heater: 12 Quarts; 13-1/2 Quarts with Dynaflow Transmission
With Heater: 13-1/2 Quarts; 15 Quarts with Dynaflow Transmission
Fuel Tank: 19 Gallons
Engine Oil: 5-1/2 Quarts
Manual Transmission Capacity: 1-3/4 Pints
Dynaflow Transmission Capacity: 9-1/2 Quarts
Rear Axle Capacity: 3-1/2 Pints
Capacities, Buick Roadmaster, Model 70
Cooling System:
Without Heater: 18 Quarts
With Heater: 19-1/2 Quarts
Fuel Tank: 19-1/2 Gallons
Engine Oil: 7 Quarts
Transmission Capacity:
Dynaflow: 11 Quarts
Rear Axle Capacity: 3-1/2 Pints
Tune-Up Data, Buick, Special, Super, & Roadmaster; Series 40, 50, & 70:
Spark Plug Gap: .025"
Spark Plug Type: AC 46X, or equivalent
Ignition Point Gap: .016"
Firing Order: 1-6-2-5-8-3-7-4
Ignition Timing Mark & Location: "ADV" Mark on Flywheel
Engine Idle Speed:
Manual Transmission: 450 RPM
Dynaflow Transmission: 450 RPM
Cylinder Head Tension: 65-70 Ft Lbs
Compression Pressure @ Cranking Speed: 114 PSI
Valve Data, Buick Special, Series 40:
Tappet Clearance, Running Hot:
Intake: .015"; With Hydralic Lifters: Zero
Exhaust: .015"; With Hydrallic Lifters: Zero
Tappet Clearance for Timing: 015"; With Hydralic Lifters: Zero
Valve Seat Angle: 45 Degrees
Valve Timing:
Intake Valve Opens: 13 Degrees BTDC
Exhaust Valve Closes: 22 Degrees ATDC
Minimum Valve Spring Pressure (New Spring):
Inner Spring: 52 Pounds @ 1-5/16"
Outer Spring: 119 Pounds @ 1-19/32"
Valve Stem Clearance:
Intake: .0025"
Exhaust: .003"
Valve Data, Buick Super, Series 50
Tappet Clearance, Running Hot:
Hydralic Lifters: Intake: Zero Exhaust: Zero
Tappet Clearance for Timing: Zero
Valve Seat Angle: 45 Degrees
Valve Timing:
Intake Valve Opens: 13 Degrees BTDC
Exhaust Valve Closes: 22 Degrees ATDC
Minimum Valve Spring Pressure (New Springs):
Inner Spring: 52 Pounds @ 1-5/16"
Outer Spring: 119 Pounds @ 1-19/32"
Valve Stem Clearance:
Intake: .0025:
Exhaust: .003"
Valve Data, Buick Roadmaster, Series 70
Tappet Clearance, Running Hot:
Hydralic Lifters: Intake: Zero Exhaust: Zero
Tappet Clearance for Timing: Zero
Valve Seat Angle: 45 Degrees
Valve Timing:
Intake Valve Opens: 14 Degrees BTDC
Exhaust Valve Closes: 25 Degrees ATDC
Minimum Valve Spring Pressure (New Springs):
Inner Spring: 52 Pounds @ 1-5/16"
Outer Spring: 119 Pounds @ 1-19/32"
Valve Stem Clearance:
Intake: .0025:
Exhaust: .003"
Piston & Ring Data, Buick Special, Series 40 & Super, Series 50:
Pistons Removed from Above
Fitting Pistons with Spring Scale:
Shim Thickness to Use: Should fall @ .0015" and hold @ .002"
Pounds Pull on Scale: Use Shim Thickness Data
Width of Ring End Gap (Minimum):
Compression: .010"
Oil Control: .010"
Clearance Between Ring & Grooves:
Compression: .0015"-.0035"
Oil Control: .0015"-.003" Flex-Fit Oil Rings: .0015"-.0035"
Wrist Pin Diameter: .8124"-.8129"
Piston & Ring Data, Buick Roadmaster, Series 70
Piston Removed from Above
Fitting Pistons with Sring Scale:
Shim Thickness to Use: Should fall @ .0015" and hold @ .002"
Pounds Pull on Scale: Use Shim thickness Data
Width of Ring End Gap (Minimum):
Compression: .010"
Oil Control: .010"
Clearance Between Ring & Grooves:
Compression: .0015"-.0035"
Oil Control: .0015"-.003" Flex-Fit Oil Rings: .0015"-.0035"
Wristpin Diameter: .8744"-.8749"
Engine Bearing Data, Buick Special, Series 40 & Super, Series 50:
Connecting Rod Bearing Journal Diameter: 2.125"-2.126"
Connecting Rod Bearing Clearance: .0005"-.002"
Connecting Rod End Play: .005"-.010"
Connecting Rod Bolt Tension: 40-45 Ft Lb
Main Bearing Journal Diameteer: 2.5625"-2.5635"
Main Bearing Clearance: .0005"-.002"
Crankshaft End Play: .004:-.008"
Main Bolt Tension: 90-100 Ft Lbs
Engine Bearing Data, Buick Roadmaster, Series 70
Connecting Rod Bearing Journal Diameter: 2.248"-2.249"
Connecting Rod Bearing Clearance: .0005"-.002"
Connecting Rod End Play: .005"-.010"
Connecting Rod Bolt Tension: 60-65 Ft Lbs
Main Bearing Journal Diameter:
#1: 2.5625" #2: 2.625" #3: 2.6875"
#4: 2.750" #5: 2.8215"
Main Bearing Clearance: .0005"-.002"
Crankshaft End Play: .004"-.008"
Main Bolt Tension: 90-100 Ft Lbs
Brake Data, Buick Special, Series 40, & Super, Series 50:
Length of Lining Per Wheel:
Front: 23"
Rear: 23"
Width of Lining: 1-3/4"
Thickness of Lining: 3/16"
Brake Shoe Clearance: .015"
Wheel Cylinder Bore:
Front: 1-1/8"
Rear: 1"
Master Cylinder Bore: 1"
Brake Data, Buick Roadmaster, Series 70:
Length of Lining Per Wheel:
Front: 23"
Rear: 23"
Width of Lining: 2-1/4"
Thickness of Lining: 3/16"
Brake Shoe Clearance: .015"
Wheel Cylinder Bore:
Front: 1-1/8"
Rear: 1"
Master Cylinder Bore: 1"
Wheel Alignment Data, All Series:
Caster: +5/8 Degrees
Camber: +1/8 Degrees
Toe In: 1/16"-1/8"
Toe Out on Turns:
Outer Wheel: 20 Degrees
Inner Wheel: 20-3/4 to 22-1/4 Degrees
Kingpin Inclination: 4-1/4 Degrees @ 3/8 Camber
Delco-Remy Distributor Specifications, All Series:
Distributor # 1110815
Rotation: Counter Clockwise
Cam Angle: 21-30 Degrees
Point Opening: .016"
Condensor Capacity: .18-.23 Mfds
Breker Arm Spring Tension: 19-23 Ounces
Centrifugal Advance Data:
Advance Starts: 1 Degree @ 250 RPM
Full Advance: 13 Degrees @ 1,500 RPM
Vacuum Advance Data
Inches of Vacuum to Start Plunger Movement: 5to 7
Inches of Vacuum for Full Plunger Travel: 10 to12
Maximum Vacuum Advance: 5-1/2 Degrees
Delco-Remy Generator & Regulator Specifications, All Series:
Generator # 1102754
Direction of Rotation: Clockwise
Generator Output: 42 Amperes @ 2,400 RPM
Brush Spring Tension 25 Ounces
Field Current @ 6 Volts: 1.9 to 2.05 Amperes
Regulator #: 1118364
Cutout Relay:
Voltage to Close Points: 6.4 Volts
Reverse Current to Open Points: 0 to 3 Amperes
Armature Air Gap: .020"
Voltage Regulator Setting: 7.4 Volts
Current Regulator Setting: 42 Amperes
Current & Voltage Armature Air Gap: .075"
Generator # 1102774
Direction of Rotation: Clockwise
Generator Output: 50 Amperes @ 2,550 RPM
Brush Spring Tension 25 Ounces
Field Current @ 6 Volts: 1.9 to 2.05 Amperes
Regulator #: 1118729
Cutout Relay:
Voltage to Close Points: 6.4 Volts
Reverse Current to Open Points: 0 to 3 Amperes
Armature Air Gap: .020"
Voltage Regulator Setting: 7.4 Volts
Current Regulator Setting: 47 Amperes
Current & Voltage Armature Air Gap: .075"
Delco-Remy Starting Motor Specifications, All Series:
Starter # 1107097
Rotation: Clockwise
Brush Spring Tension: 24-28 Ounces
No Load Test: 65 Amperes, 5.67 Volts @ 5,000 RPM
Lock Test: 525 Amperes, 3.37 Volts; Torque: 12 Ft Lbs
Starter # 1107981
Rotation: Clockwise
Brush Spring Tension: 24-28 Ounces
No Load Test: 65 Amperes, 5.0 Volts @ 5,500 RPM
Lock Test: 600 Amperes, 3.0 Volts; Torque: 16 Ft Lbs
Stromberg Carburetor Adjustments:
Carburetor Model: AAUVB & AAVB
Idle Adjustment: 1-1/4 Turns Opem
Fuel Level: 5/64" below top of gasket surface
Carter Carburetor Specifications:
Carburetor Model #WCD
Carburetor Part # 725S-SA
Float Level: 5/32"
Idle Screw Setting, 7/8 to 1-3/8 Turns to Open
Pump Adjustment Using Gauge T109-117S: 33 (Short Stroke)
Fast Idle Setting: .015"
Unloader Adjustment: 3/16"
Automatic Choke Setting: 1 Rich
Carburetor Model #WCD
Carburetor Part # 726S-SA
Float Level: 5/32"
Idle Screw Setting, 3/4 to 1-1/4 Turns to Open
Pump Adjustment Using Gauge T109-117S: 33 Short Stroke
Fast Idle Setting: .018"
Unloader Adjustment: 3/16"
Automatic Choke Setting: 1 Rich
Carburetor Model #WCD
Carburetor Part # 833S
Float Level: 5/32"
Idle Screw Setting, 1 to 1-1/2 Turns to Open
Pump Adjustment Using Gauge T109-117S: 33 Short Stroke
Fast Idle Setting: .018"
Unloader Adjustment: 3/16"
Automatic Choke Setting: 1 Rich
Carburetor Model #WCD
Carburetor Part # 882S-SA
Float Level: 5/32"
Idle Screw Setting, 1-1/4 to 1-3/4 Turns to Open
Pump Adjustment Using Gauge T109-117S: 33 Short Stroke
Fast Idle Setting: .012"
Unloader Adjustment: 3/16"
Automatic Choke Setting: 1 Rich
Fuel Pump Data:
Maximum Pressure: 4 to 5 PSI
1951 Buick Beginning Engine Numbers:
Series 40: 6240100-4
Series 50: 6240100-5
Series 70: 6240100-7
1951 Buick Beginning Serial Numbers, All Series:
1-6031301, Flint Michigan
2-6050001, Southgate, California
3-6055001, Linden, New Jersey
4-6061001, Kansas City, Missouri
5-6070001, Wilmington, Delaware
6-6075001, Atlanta, Georgia
7-6080001, Framingham, Massachusetts
Popular Options, All Series:
Sonomatic Radio, Weather-Warden Heater & Defroster, Side View Mirror, EZI-Non Glare Rear View Mirror, Remote Control Outside Rear View Mirror, Vanity Visor Mirror, Spot Light With Mirror, Auxillary Driving Lights, Multi-Purpose Trouble Light, Back-Up Lights, Tissue Dispenser, Breeze-Ease Draft Deflectors, Exhaust Pipe Trim, Tool Kit, Full Wheel Covers on Series 40 & 50, Handy Mats, All Rubber Floor Mat, Polish Cloth Kit, Seat Covers, Dynaflow Transmission on Special & Super.
1951 Buick Paint Codes & Colors:
Code Color
5101 Black
5102 Verde Green
5103 Imperial Blue Poly
5104 Geneva Green Poly
5105 Barton Gray
5106 Olympic Blue Poly
5107 Victoria Maroon Poly
5108 Sharon Green Poly
5109 Cloudmist Gray Poly
5110 Old Ivory
5119 Calumet Green Poly
5121 Venetian Blue Poly
5123 Galena Blue Poly
5126 Glenn Green
Sky Gray
Two Tones
5111 Sky Gray Upper & Verde Green Lower
5112 Sky Gray Upper & Olympic Blue Poly Lower
5113 Sky Gray Upper & Victoria Maroon Lower
5114 Sky Gray Upper & Sharon Green Poly Lower
5115 Sky Gray Upper & Cloudmist Gray Poly Lower
5116 Imperial Blue Poly Upper & Barton Gray Lower
5120 Sky Gray Upper & Calumet Green Lower
5122 Sky Gray Upper & Venetian Blue Poly Lower
5124 Sky Gray Upper & Galena Blue Lower
5125 Imperial Blue Poly Upper & Galena Blue Poly Lower
5128 Calumet Green Poly Upper & Glenn Green Lower
1951 Buick Historical Data:
1951 Buick Model Year Production: 399,732.
Promotional Model Cars Available:
None
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