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1958 Dodge/Mopar 230 L6 Engine Specifications

Courtesy of Shannon Mafodda



Specifications for 1958 Coronet 6-Cylinder L-Head Engine
TypeL head Straight Six
Bore and stroke3.25 x 4.63"
Piston Displacement (cu. Inch)230.2
Taxable Horsepower (ama)25.35
Compression Ratio8.0 to 1
Compression Pressure (speed minimum 150 rpm,

plugs removed, wide open throttle)
120 to 150 lbs
Maximum Brake horse power at 3600 rpm123
Firing order1-5-3-6-2-4
Camshaft
DriveChain
End Paly.002-.006"
Radial Clearance.001-.003""
Camshaft Journals
Diameter and LengthNo.1 1.998-1.99 x 7/8"
No.2 1.982-1.983 x 3/4"
No.3 1.967-1.968 x 3/4"
No.4 1.951-1.952 x 3/4"
No.5 1.4355-1.4365 x 15/16"
Crankshaft
TypeCounter Balanced
Bearingsreplaceable
End Play.003-.007"
Radial Clearance.0005-.0015"
Connecting Rods
Length (center to center)7 13/16"
Diameter and Length2 1/16 x 1"
Connecting Rod Bushing
TypeBronze
Diameter and Length55/64 x 1 1/8''
Pistons
Clearance (3/4 inch from bottom on thrust face).002 to .0012"
Weight (Standard through all oversize)16 oz
Ring Groove Width (Compression).0169"
(oil).172"
Valves (intake)
Head Diameter1 17/32"
Lift23/64"
Stem Diameter.340 to .341"
Stem to Guide Clearance.001 to.003"
Valves (Exhaust)
Head Diameter1 13/32"
Lift23/64"
Stem Diameter.340 to .341"
Stem to Guide Clearance.003 to.005"
Distributor For 6 Cylinder
ModelIBR-4001
RotationClockwise
Advance ControlAutomatic
Point Gap.018 to .022"
Breaker Arm Spring Tension17 to 20
Contact Dwell (degrees)39+/- 3 Deg
Automatic Advance curve (Distributor speed)
250 to 4500 Deg
4500 to 2 Deg
11505.5 to 7.5 Deg
18007.5 to 9.5 Deg
Vacuum Advance Curve
Manifold vacuum in inches of mercury
5.25 to 6.750 Deg
103.5 to 5.5 Deg
168.5 to 10.5 deg
Condenser Capacity (Microfarads).25 to .285
Timing Mark location (marks 1 deg apart)Vibration Damper
Engine Idle Speed (RPM)450 to 500
Firing Order1-5-3-6-2-4


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