1958 Chevrolet 348 (300 hp) V8 Engine Specs

Model Designation: 150, 210 & Bel Air w/ solid valve lifters, 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: 11.00

Maximum Brake Horsepower: w/4-barrel carb: 300 @ 5600 RPM

Maximum Torque Lbs.Ft. @ RPM: w/4-barrel carb: 350 @ 3600 RPM

Normal Oil Pressure Pounds: 35

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

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

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 BTDC Exhaust 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

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)

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