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ENGINE SPECS

1947 Pontiac 249 Inline 8 Engine Specs

GENERAL SPECIFICATIONS

Model Designation: Torpedo 8: 47-27; Streamliner 8: 47-28

Wheel base: Torpedo 8: 119; Streamliner 8: 122

Valve Location: In block

Bore and Stroke: 3-1/4 x 3-3/4

Piston displacement, Cubic Inches: 248.9

Compression ratio: 6.50

Maximum Brake Horsepower: 107 @ 3700 RPM

Maximum Torque Lbs.Ft. @ RPM: 190 @ 2000 RPM

Normal Oil Pressure Pounds: 35

TUNE UP SPECIFICATIONS (all models)

Spark Plug Make: AC 45

Spark Plug Gap, Inch: .025

Firing Order: 16258374

Timing Mark: IGN; location: flywheel

Engine Idle Speed, RPM:  Standard transmission: 450; w/automatic 375 (in drive)

Cylinder Head Torque Lbs.Ft.: 60

Compression Pressure & Cranking Speed: 120 Min.

Voltage & Polarity: 6 volts, negative ground

PISTON AND RING SPECIFICATIONS

Fitting Pistons with Scale: Pistons removed from above. Shim thickness: .0015

Pounds on a Pull Scale: 10 to 20

Ring End Gap: In tapered bores, fit rings in tightest portion of ring travel
Compression: .008
Oil: .008

Clearance in Groove: Compression: .0015-003; Oil: .001-.0025

Wristpin Diameter, Inch: .9369-.9375

VALVE SPECIFICATIONS

Operating Clearance:
     Intake: .012 Hot   Exhaust: .012 Hot

Valve Seat Angle, degrees: Intake: 30; Exhaust: 45

Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
         Intake opens: 5 degrees BTDC
         Exhaust Closes: 5 degrees ATDC

Valve Spring Pressure Pounds at Inches Length:
    Inner Spring: 56 @ 1-29/32

Valve Stem Clearance: Intake & Exhaust: Guides taper .001" per inch. When started in guide, the valve should fall through.

Clearance for Timing Intake: .015

ENGINE BEARING SPECIFICATIONS

Connecting Rod Bearings:
    Journal Diameter, Inches: 1.9987-1.9997
    Bearing Clearance, Inch: .0005-.002
    Rod End Play, Inch: .007-.012
    Rod Bolt Tension: Lbs.Ft.: 45-50

Main Bearings:
    Journal Diameter, Inches:
        Front: 2.3732-2.3742
        No. 2: 2.4044-2.4047
        No. 3: 2.4357-2.4367
        No. 4: 2.4669-2.4697
        No. 5: 2.4982-2.4992
    Bearing clearance: .0003-.0023
    Shaft End Play: .003-.008    (Thrust is controlled by rear intermediate bearing)
    Main Bolt Tension: Lbs.Ft.: 80-90

CAPACITY DATA

Cooling System:
    Without heater: 19-1/2 quarts
    Without heater: 21 quarts

Fuel Tank: 21 gallons

Engine Oil: 5 quarts

Transmission: w/out overdrive: 1-3/4 pints

Rear Axle: 3-1/4 pints

DELCO-REMY DISTRIBUTOR SPECIFICATIONS

Distributor part number: 1110804 (distributor rotates counter-clockwise)

Cam Angle, degrees: 21-30

Breaker Point opening, Inch: .016

Condenser Capacity: .18-.23 Mfds.

Breaker Arm Spring Tension: 19-23 Oz.

Centrifugal Advance: (degrees at RPM of distributor)
    Advance starts: 2 @ 400 RPM
    Full Advance: 11 @ 2000 RPM

    Inches of Vacuum to Start Plunger Movement: 5-7
    Inches of Vacuum for Full Plunger Movement: 17-1/2 - 19-1/2
    Maximum Vacuum Advance Dist., Degrees: 10

DELCO-REMY GENERATOR SPECIFICATIONS

Generator Number: 1102665 (generator rotates clockwise, 6 volts, Negative Ground)

Generator output: 30 amps @ 2050 RPM

Brush Spring Tension: 28 oz.

Field Current at 6 Volts: 1.75-1.95

DELCO-REMY REGULATOR SPECIFICATIONS

Regulator Number: 1118242

Cutout Relay:
    Voltage to close points: 6.4
    Reverse current to open points: 0-3
    Armature Air Gap: .020

Voltage Regulator Setting: 7.4 volts

Current and Voltage Armature Air Gap: .075 inches

Current Regulator Setting: 36 amps

DELCO-REMY STARTING MOTOR SPECIFICATIONS

Part number: 1107921 (rotates clockwise)

Bush Spring Tension, Ounces: 24-28

No Load Test: 60 amps, 5.0 volts @ 6000 RPM

Torque Test: 600 Amps, 3.0 volts, Torque, Lbs.Ft.: 15

WHEEL ALIGNMENT SPECIFICATIONS

Caster, Degrees
    Limits: -1/2 to - 1
    Desired: - 3/4

Camber, Degrees
    Limits: -1/4 to +1/4
    Desired: 0

Toe-In, Inches: 0 to 1/16

Toe-Out on Turns, Degrees: (If toe-out is incorrect, when other adjustments are correct, look for bent steering arms.)
    Outer wheel: 20
    Inner Wheel: 22-1/2 to 23-1/2

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 steering knuckle support)
    4-3/8 to 4-7/8