Revised 02/15/13

Summary of Letter Car Distributors

Identification


Distributor Number

1955 C300

1AZ4001G, 1658989

300B

1704309, IBK-4301C

300C

1689325, IBK-4304

300D

IBS 4007A; 1841515

300D Fuel Injection

IBS 4008

300E

IBS-4010, 1842805

300F

Autolite IBS-4011; Chrysler number 1889568

300G

Autolite IBS-4011; Chrysler number 1889568

300H

2098313, IBS-4011AS

300J

2098620 (Auto-lite)

300K

2444361, IBS-4011C

300K ram

2444364, IBS-4011D

300L

2444683 (Chrysler), IBS-4006K (Prestolite)



Specifications

1955 C-300
Engine Idle Setting: 600 RPM, Ignition Timing: 100 B.T.D.C.
Note: Reduce engine idle to 500 RPM, set ignition at 10
0 B.T.D.C. and reset engine idle back to 600 RPM. Ref: 1955 Chrysler Service Manual Page 285. Additional note: Distributor components are identical to those found on many other 1955 Chrysler product V-8 engines EXCEPT for the governor weight spring set, cam and stop plate and vacuum chamber. Ref 1955-58 Chrysler Passenger Car Parts List.

Automatic Advance Curve
(distributor degrees and distributor RPM)

00 at 300 to 400 RPM


00 to 3.50 at 400 RPM


30 to 50 at 500 RPM


70 to 90 at 800 RPM

Vacuum Advance Curve
(distributor degrees at inches of mercury)

10 at 5.5” to 6.5”


50 to 6.50 at 10”


60 to 80 at 11”


300B

Automatic Advance Curve
(distributor degrees and RPM)

00 at 350 to 450


00 to 4.250 at 450


2.80 to 4.80 at 500


70 to 90 at 1200

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

Start at 7” to 8”


20 at 8.5” to 9.5”


60 at 11.25” to 12.75”


70 to 90 at 13.5”


300C

Advance Curves

IBK 4304; 1689325

Automatic Advance Curve
(distributor degrees and RPM)

00 at 250 to 450


00 to 20 at 450


40 to 60 at 875


90 to 110 at 2250

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

Start at 7.5” to 8.75”


20 at 8.75” to 10.2”


60 at 11.75” to 13.4”


100 to 120 at 18”


300D

Advance Curves

IBK 4304; 1689325

Automatic Advance Curve
(distributor degrees and RPM)

00 at 220 to 490


00 to 20 at 490


20 to 40 at 750


3.50 to 4.50 at 850


80 to 110 at 2400

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 7.5” to 8.5”


4.50 to 6.50 at 11”


100 to 120 at 16”


300E

Automatic Advance Curve
(distributor degrees and RPM)

00 at 310 to 490


00 to 20 at 490


3.50 to 5.50 at 800


60 to 80 at 1500


8.50 to 10.50 at 2300

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 7.5” to 9.1”


60 to 90 at 13”


11.50 to 14.50 at 18.2”


300F, 300G

Automatic Advance Curve
(distributor degrees at distributor RPM)

00 at 325 to 475


00 to 4.30 at 475


4.50 to 6.50 at 640


90 to 110 at 2400

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 7.2” to 8.9”


4.50 to 7.50 at 12”


7.50 to 10.50 at 14.5”


300H

Automatic Advance Curve
(distributor degrees at distributor RPM)

00 at 325 to 475


00 to 30 at 475


4.50 to 6.50 at 640


90 to 110 at 2400

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 7.2” to 8.9”


4.50 to 7.50 at 12”


7.50 to 10.50 at 14.5”


300J

Automatic Advance Curve
(distributor degrees at distributor RPM)

00 at 525 to 675


00 to 30 at 675


4.50 to 6.50 at 910

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 6” to 9”


4.50 to 7.50 at 12”


7.50 to 10.50 at 14.3”


300K

Automatic Advance Curve
(distributor degrees at distributor RPM)

00 at 325 to 475


00 to 40 at 475


4.50 to 6.50 at 640


90 to 110 at 2400

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 7.2” to 8.9”


4.50 to 7.50 at 12”


7.50 to 10.50 at 14.5”



300K Ram

Automatic Advance Curve
(distributor degrees at distributor RPM)

00 at 525 to 675


00 to 30 at 675


4.50 to 6.50 at 910

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 6” to 9”


4.50 to 7.50 at 12”


7.50 to 10.50 at 14.3”


300L

Automatic Advance Curve
(distributor degrees at distributor RPM)

00 at 325 to 475


00 to 40 at 475


4.50 to 6.50 at 640


90 to 110 at 2400

Vacuum Advance Curve
(distributor degrees at Inches of Mercury)

00 at 7.2” to 8.9”


4.50 to 7.50 at 12”


7.50 to 10.50 at 14.5”


Thanks to Rich Barber for some of the data.

Photos of a K distributor


A beat up tag, but still legible.

The tach drive mechanism is contained in the casting below the tag, with a metal cap screwed on.
Manual transmission Ks used the drive.
Automatic transmission Ks didn't use the drive and had a cap for dirt prevention.
The brass cap is the grease cup for the distributor shaft bearing.

Sharp eyes might notice the L distributor curve matches the F.
Perhaps this is not surprising since both use the same cam shaft.


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