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Second Chance Garage

For the Classic Car Restoration Enthusiast

Second Chance Garage


Second Chance Garage

For the Classic Car Restoration Enthusiast

Second Chance Garage

Second Chance Garage

For the Classic Car Restoration Enthusiast

Second Chance Garage

ENGINE SPECS

1958 Chevrolet 348 (250 hp) V8 Engine Specs

GENERAL SPECIFICATIONS

Model Designation: 150, 210 & Bel Air w/4-barrel carburetor & Dual Exhaust (all engines available)

Wheel base: 117-1/2

Valve Location: In head

Bore and Stroke: 4.125 x 3.25

Piston displacement, Cubic Inches: 348

Compression ratio: 9.50

Maximum Brake Horsepower: w/4-barrel carb: 250 @ 4400 RPM

Maximum Torque Lbs.Ft. @ RPM: w/4-barrel carb: 355 @ 2800 RPM

Normal Oil Pressure Pounds: 35

TUNE UP SPECIFICATIONS (all models)

Spark Plug Make: AC 44

Spark Plug Gap, Inch: .035

Firing Order: 18436572 (front to rear left bank: 1-3-5-7, right bank: 2-4-6-8)

Timing Mark: 4 degrees BTDC; Location: Damper

Engine Idle Speed, RPM: 425

Compression Pressure & Cranking Speed: 160 min.

Voltage & Polarity: 12 volts, negative ground

PISTON AND RING SPECIFICATIONS

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

Pounds on a Pull Scale: 7-18

Ring End Gap: In tapered bores, fit rings in tightest portion of ring travel
Compression: .015
Oil: .015

Wristpin Diameter, Inch: .9896

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VALVE SPECIFICATIONS

Operating Clearance: Intake: 0 Exhaust: 0

Valve Seat Angle, degrees: 45

Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 29-2/3 BTDCExhaust Closes: 36-5/6 ATDC

Valve Spring Pressure Pounds at Inches Length: Inner Spring: 184 @ 1.23

Valve Lift Zero Lash: Intake: .3987 Exhaust: .3987

Stem Diameter: Intake: .3715-.3722 Exhaust: .3410-.3417

Valve Stem Clearance: Intake: .001-.0027;Exhaust: .0025-.0042

ENGINE BEARING SPECIFICATIONS

Connecting Rod Bearings: Journal Diameter, Inches: 2.199-2.200
Bearing Clearance, Inch: .0007-.0027

Main Bearings: Journal Diameter, Inches: 2.4980-2.4990
Bearing clearance: .0006-.0032
Shaft End Play: .003-.007(Thrust on Bearing 5)

ENGINE TIGHTENING SPECIFICATIONS

Spark Plugs: 25

Cylinder Head Bolts: 60-70

Intake Manifold: 25-35

Exhaust Manifold: Center clamp bolts 25-30; end clamp bolts: 15-20

Rocker Arm Shaft Bracket: none

Rocker Arm Covers: 25 (inch/lbs)

Connecting Rod Cap Bolts: 35-45

Main Bearing Cap Bolts: 95-105

Flywheel to Crankshaft: 55-65

Vibration Damper or Pulley: Pressed on

CAPACITY DATA

Cooling System: Without heater: 22 quarts
With heater: 23 quarts

Fuel Tank: 20 gallons; Station Wagon 17 gallons

Engine Oil: 4 quarts + 1 quart for filter change

Transmission: Standard: 2 pints; w/overdrive: 3 pints; Automatic: 3-1/2 quarts

Rear Axle: 4 pints

DISTRIBUTOR SPECIFICATIONS DATA

Distributor part number: 1110907 (distributor rotates counter-clockwise)

Cam Angle, degrees: 30

Breaker Point opening, Inch: Turn adjusting screw in (clockwise) until engine misfires. Then turn screw 1/2 turn in opposite direction.

Condenser Capacity: .18-.23 Mfds.

Breaker Arm Spring Tension: 19-23 Oz.

Centrifugal Advance: (degrees at RPM of distributor)
Advance starts: 1-1/2 @ 425 RPM
Full Advance: 12 @ 2000 RPM
Inches of Vacuum to Start Plunger Movement: 7-9
Inches of Vacuum for Full Plunger Movement: 15 - 16
Maximum Vacuum Advance Dist., Degrees: 7-1/2

GENERATOR SPECIFICATIONS

Generator Number: 1102043, 1102096, 1102097, 1102114, 1102115, 1102059 (generator rotates clockwise, 12 volts, Negative Ground)

Generator output: 1102043: 30 amps @ 2310 RPM;
1102096: 30 amps @ 2240 RPM;
1102097: 30 amps @ 2240 RPM;
1102114: 35 amps @ 2630 RPM;
1102115: 35 amps @ 2630 RPM;
1102059: 30 amps @ 2310 RPM

Brush Spring Tension: 28 oz.

REGULATOR SPECIFICATIONS

Regulator Number: 1119001, 1119002

Cutout Relay: Voltage to close points: 12.6
Armature Air Gap: .020

Voltage Regulator Setting: 14.3 volts

Current and Voltage Armature Air Gap: .075 inches

Current Regulator Setting: 30 amps

STARTING MOTOR SPECIFICATIONS

Part number: 1107668; 1107687 (rotates clockwise)

Bush Spring Tension, Ounces: 35

No Load Test: 65-100 amps, 10.6 volts @ 3600-5100 RPM

Torque Test: 300-350 Amps, 3.5 volts; 10-1/2 ft.lbs torque

WHEEL ALIGNMENT SPECIFICATIONS

Caster, Degrees
Limits: +1/2 to +1-1/2
Desired: +1

Camber, Degrees
Limits: 0 to +1
Desired: +1/2

Toe-In, Inches: 5/32 to 7/32

Toe-Out on Turns, Degrees: (If toe-out is incorrect, when other adjustments are correct, look for bent steering arms.)
Outer wheel: 18-1/2
Inner Wheel: 20

Steering Axis Degrees: (If spindle support angle is incorrect, but camber is correct, look for bent suspension arms or steering knuckle support) 3-1/2 to 4-1/2

Other 1958 Chevrolet Engine Specs

1958 Chevrolet 348 (250 hp) V8 Engine Specs

1958 Chevrolet 348 (250hp) V8 Engine Distributor Specs

1958 Chevrolet 348 (250hp) V8 Engine Generator Specs

1958 Chevrolet 348 (250hp) V8 Engine Regulator Specs

1958 Chevrolet 348 (250hp) V8 Engine Starting Motor Specs

1958 Chevrolet 348 (250 hp) V8 Engine Tightening Specs

1958 Chevrolet Wheel Alignment Specs


Other 1958 Chevrolet Engine Options

1958 Chevrolet 265 (145 hp) Inline 6 Engine Specs

1958 Chevrolet 283 (185 hp) V8 Engine Specs

1958 Chevrolet 283 (250 hp) V8 Engine Specs

1958 Chevrolet 348 (280 hp) V8 Engine Specs

1958 Chevrolet 283 (290 hp) V8 Engine Specs

1958 Chevrolet 348 (300 hp) V8 Engine Specs

1958 Chevrolet 348 (315 hp) V8 Engine Specs

Return to Chevrolet Engine Specs Index


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