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1958 Dodge/Mopar 230 L6 Engine Specifications

Specifications for 1958 Coronet 6-Cylinder L-Head Engine
Type L head Straight Six
Bore and stroke 3.25 x 4.63"
Piston Displacement (cu. Inch) 230.2
Taxable Horsepower (ama) 25.35
Compression Ratio 8.0 to 1
Compression Pressure (speed minimum 150 rpm,
plugs removed, wide open throttle)
120 to 150 lbs
Maximum Brake horse power at 3600 rpm 123
Firing order 1-5-3-6-2-4
Camshaft
Drive Chain
End Paly .002-.006"
Radial Clearance .001-.003""
Camshaft Journals
Diameter and Length No.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
Type Counter Balanced
Bearings replaceable
End Play .003-.007"
Radial Clearance .0005-.0015"
Connecting Rods
Length (center to center) 7 13/16"
Diameter and Length 2 1/16 x 1"
Connecting Rod Bushing
Type Bronze
Diameter and Length 55/64 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 Diameter 1 17/32"
Lift 23/64"
Stem Diameter .340 to .341"
Stem to Guide Clearance .001 to.003"
Valves (Exhaust)
Head Diameter 1 13/32"
Lift 23/64"
Stem Diameter .340 to .341"
Stem to Guide Clearance .003 to.005"
Distributor For 6 Cylinder
Model IBR-4001
Rotation Clockwise
Advance Control Automatic
Point Gap .018 to .022"
Breaker Arm Spring Tension 17 to 20
Contact Dwell (degrees) 39+/- 3 Deg
Automatic Advance curve (Distributor speed)
250 to 450 0 Deg
450 0 to 2 Deg
1150 5.5 to 7.5 Deg
1800 7.5 to 9.5 Deg
Vacuum Advance Curve
Manifold vacuum in inches of mercury
5.25 to 6.75 0 Deg
10 3.5 to 5.5 Deg
16 8.5 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 Order 1-5-3-6-2-4

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