1950 Buick 248 (122 hp) Inline 8 Engine Specs

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GENERAL SPECIFICATIONS

Model Designation: Special 8 - Series 40 with Dynaflow

Wheel base: Special 8: 121-1/2

Valve Location: In head

Bore and Stroke: 3-3/32 x 4-1/8

Piston displacement, Cubic Inches: 248

Compression ratio: 7.2

Maximum Brake Horsepower: 122 @ 3600 RPM

Maximum Torque Lbs.Ft. @ RPM: 215 @ 2000 RPM

Normal Oil Pressure Pounds: 35

TUNE UP SPECIFICATIONS

Spark Plug Make: AC 46X

Spark Plug Gap, Inch: .025

Firing Order: 16258374

Ignition Timing: ADV. Timing mark on Flywheel

Engine Idle Speed, RPM: 450

Cylinder Head Torque Lbs.Ft.: 65-70

Compression Pressure & Cranking Speed: 114 Min.

Voltage & Polarity: 6 volts, negative ground

PISTON AND RING SPECIFICATIONS

Fitting Pistons with Scale:
Piston should fall on a .0015 feeler and stay on a .00225 feeler

Ring End Gap: (Fit rings in tapered bores for clearance shown in tightest portion of ring travel.)
Compression: .010
Oil: .010 (no fitting necessary with Flex-Fit oil rings)

Clearance in Groove: Compression: .0015-0035; Oil: .0015-.003 (Flex-Fit oil rings: .0015-.0035

Wristpin Diameter, Inch: .8124-.8129

VALVE SPECIFICATIONS

Operating Clearance:
Intake: .015 Hot Exhaust: .015 Hot (with hydraulic lifters clearance is 0)

Valve Seat Angle, degrees: 45

Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 13 degrees BTDC
Exhaust Closes: 22 ATDC

Valve Spring Pressure Pounds at Inches Length:
Inner Spring: 52 @ 1-5/16; Outer Spring: 119 @ 1-19/32

Valve Stem Clearance: Intake: .0025; Exhaust: .003

ENGINE BEARING SPECIFICATIONS

Connecting Rod Bearings:
    Journal Diameter, Inches: 1.998-1.999
    Bearing Clearance, Inch: .0005-.002
    Rod End Play, Inch: .005-.010
    Rod Bolt Tension: Lbs.Ft.: 40-45

Main Bearings:
    Journal Diameter, Inches:
        No. 1: 2.3105 - 2.3115
        No. 2: 2.3735 - 2.3745
        No. 3: 2.4355 - 2.4365
        No. 4: 2.4985 - 2.4995
        No. 5: 2.5605 - 2.5615
    Bearing clearance: .0005-.002
    Shaft End Play: .004-.008    (Thrust on Bearing No. 3)
    Main Bolt Tension: Lbs.Ft.: 90-100

CAPACITY DATA

Cooling System:
Without heater: 13 quarts (with Dynaflow 14)
With heater: 14-1/2 quarts (with Dynaflow 15-1/4)

Fuel Tank: 19 gallons

Engine Oil: 5-1/2 quarts

Transmission: 1-3/4 w/auto 9-1/2 qts.

Rear Axle: 4 pints

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