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ENGINE SPECS

1956 Ford 312 V8 Engine Specs

GENERAL SPECIFICATIONS

Model Designation: V8 - P6

Wheel base: 115-1/2

Valve Location: In head

Bore and Stroke: 3.80" x 3.44"

Piston displacement, Cubic Inches: 312

Compression ratio:
   w/overdrive: 8.4;
    w/Fordomatic: 9.0

Maximum Brake Horsepower:
    w/overdrive: 215 @ 4600 RPM
    w/Fordomatic: 225 @ 4600 RPM

Maximum Torque Lbs.Ft. @ RPM:
    w/overdrive: 317 @ 2600
    w/Fordomatic: 324 @ 2600

Normal Oil Pressure Pounds: 50

TUNE UP SPECIFICATIONS

Spark Plug Make: Champion 870

Spark Plug Gap, Inch: .035

Firing Order: 15486372 (from front to rear: Right 1-2-3-4; left 5-6-7-8

Ignition Timing: Marks on Vib. Damp. Wide mark is TDC, each succeeding mark represents 2, 4, 6, 8 and 10 degrees before TDC. Set timing 3 degrees BTDC on cars with manual shift transmission and 6 degrees BTDC on Fordomatic equipped cars.

Engine Idle Speed, RPM: Manual shift trans. 475; automatic shift trans. 450

Cylinder Head Torque Lbs.Ft.: 60-75

Compression Pressure & Cranking Speed: 160 Min.

PISTON AND RING SPECIFICATIONS

Fitting Pistons with Scale:
    Removed from Above
    Shim thickness to use: .002
    Pounds Pull on Scale: 5 to 10

Rings: (for tapered bores for minimum clearance fit rings in tightest portion of ring travel)
    Ring Gap, Minimum: Compression: .010
    Ring Gap, Minimum: Oil: .015
    Clearance in Groove: Compression: .002-.0035
    Clearance in Groove: Oil: .0015-.003

Wristpin Diameter, Inch: .9120-.9123

VALVE SPECIFICATIONS

Operating Clearance:
    Intake: .019 Hot
    Exhaust: .019 Hot

Clearance for Timing Intake: .019

Valve Seat Angle, degrees: 45

Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
    Intake opens: 12 degrees BTDC
    Exhaust Closes: 8 degrees ATDC

Valve Spring Pressure Pounds at Inches Length:
     Spring: 64 @ 1.78

Valve Stem Clearance:
    Intake: .004
    Exhaust: .005

ENGINE BEARING SPECIFICATIONS

Connecting Rod Bearings:
       Journal Diameter, Inches: 2.1880-2.1888
        Bearing Clearance, Inch: .036 Max.
        Rod End Play, Inch: .019 Max.
        Rod Bolt Tension, Lbs.Ft.: 45-50

Main Bearings:
        Journal Diameter, Inches: 2.6235-2.6243
        Bearing Clearance, Inch: .0036 Max.
        Crankshaft End Play, Inch (taken on No. 3 bearing): .010 Max.
        Main Bolt Tension, Lbs.Ft.: 120-130 NOTE: Ford changed the Main Bolt Tension for this engine in 1957 to 95-105 Lbs.Ft. to resolve cracking problems.

CAPACITY DATA

Cooling System:
    Without heater: 19 quarts
    With heater: 20 quarts

Fuel Tank: 17 gallons (station wagons and couriers 19 gallons)

Engine Oil: 5 quarts

Transmission:
    without overdrive: 3 pints, Thunderbird: 3-1/2 pints
    with overdrive: 3, station wagon 4-1/2, Thunderbird 4-1/2
Automatic Transmission: 9-3/4 quarts, Thunderbird 10-1/4

Rear Axle: 4 pints; Station wagon: 3, Thunderbird 3

STARTING MOTOR SPECIFICATIONS

Unit Number: FAR-11001A

Brush Spring Tension: 48-56 ounces

No Load Test: 120 Amps, 12 Volts @ 4800 RPM

Torque Test: 550 Amps, 5.0 Volts, 15.5 Lbs.Ft. Torque

LOADAMATIC DISTRIBUTOR SPECIFICATIONS

Cam Angle, degrees: 28

Breaker Gap, Inch: .014-.016

Condenser Capacity: .21-.25 Mfds.

Breaker Arm Spring Tension: 17-20 Oz.

Distributor Vacuum Advance Data:
Centrifugal Advance: (w/4 barrel carb.)
        Degrees advance at 300 RPM: 0 - 1/2, Inches vacuum: .16
        Degrees advance at 400 RPM: 0 - 1, Inches vacuum: .29
        Degrees advance at 800 RPM: 5-1/2 - 6-1/2, Inches vacuum: .88
        Degrees advance at 1200 RPM: 8-1/2 - 9-1/2, Inches vacuum: 1.27
        Degrees advance at 1600 RPM: 11 - 12, Inches vacuum: 1.73
        Degrees advance at 2000 RPM: 13 - 14, Inches vacuum: 2.19

GENERATOR SPECIFICATIONS

Generator Number: FAR-10000B, FAS-10000C (generator rotates clockwise)

Generator output:
   30 Amps @ 3000

Brush Spring Tension: 30 oz.

REGULATOR SPECIFICATIONS

Regulator Number: FAP-10505

Cutout Relay:
    Voltage to close points: 12.4
    Reverse Current to Open Points: 2-6 amps
    Voltage regulator setting: 15.0 volts
    Current regulator settins: 30 amps

ENGINE TIGHTENING SPECIFICATIONS (FT. LBS.)

Spark Plugs: 15-20

Cylinder Head Bolts: 65-70

Intake Manifold: 23-28

Exhaust Manifold: 23-28

Rocker Arm Shaft Bracket: 12-15

Rocker Arm Cover: 2 - 2-1/2

Connecting Rod Cap Bolts: 45-50

Main Bearing Cap Bolts: 120-130

Flywheel to Crankshaft: 75-85

Vibration Damper or Pulley: 130-145

REAR AXLE AND BRAKE CYLINDER SPECIFICATIONS

Ring Gear & Pinion Backlash, Inch:
     Passenger Car:
.003-.008
    Station Wagon: .003-.008

Drive Pinion Adjustment:
     Passenger Car:
Shims
    Station Wagon: Shims

Drive Pinion Bearing Adjustment:
     Passenger Car:
Spacer
    Station Wagon: Spacer

Axle Shaft End Play, Inch:
     Passenger Car:
None
    Station Wagon: None

Hydraulic Cylinder Bore Sizes, Inch:
    Wheel Cylinder:
          Front:
1-1/8
        Rear: 7/8 (incl Thunderbird) (station wagon: 15/16)
    Master Cylinder: 1

WHEEL ALIGNMENT SPECIFICATIONS

Caster, Degrees
    Limits: 1/2 to + 1-1/2 (incl Thunderbird)
    Desired: 1 (incl Thunderbird)

Camber, Degrees
    Limits: 1/4 to +1-1/4 (incl Thunderbird)
    Desired: +3/4 (incl Thunderbird)

Toe-In, Inches: 1/16 to 1/8 (incl. Thunderbird)

Toe-Out on Turns, Degrees: (If toe-out is incorrect, when other adjustments are correct, look for bent steering arms.)
    Outer wheel: 20 (incl Thunderbird)
    Inner Wheel: 24-1/2 (incl Thunderbird)

Kingpin Angle, or Steering Axis Degrees: (If king pin or spindle support angle are incorrect, but camber is correct, look for bent suspension arms or spindle support)
    7° 7' (incl Thunderbird)


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