1958 Dodge/Mopar 230 L6 Engine Specificatons

Courtesy of Shannon Mafodda

Neither Allpar nor Mr. Mafodda take any responsibility for the accuracy of the information presented here or for any consequences of its use or abuse.

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

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