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CADILLAC
1965-75 Tune-up Specifications
 
Year
Engine or 
Car Model
Spark Plug
Type (AC) 
- Gap
Point
Gap
Dwell
Angle
Firing
Order
Ignition Timing 
(BTDC or Mark)
1
Hot Idle
Std.
Tran
Auto
Tran 2
1965
V8-429
44 -.035
5
30
18726543
-
480D 6
1966
Standard car
44 -.035
5
30
18726543
-
480D 4
With A.I.R
44 -.035
5
30
18726543
-
550D 4
With A.I.R & A/C
44 -.035
5
30
18726543
-
550D 4
1967
Without A.I.R
44 -.035
5 30 18726543
-
480D 4
With A.I.R
44 -.035
5 30 18726543
-
550D 4
With A.I.R & A/C
44 -.035
5
30
18726543
-
550D 4
1968
ALL
44N -.035
5
30 15634278
-
550D 4
1969
ALL
R44N-.035
5
30
15634278
-
550D 4
1970
ALL
R46N-.035
5
30
15634278
7.5°
-
600D 4
1971-72
ALL
R46N-.035
5
30
15634278
-
600D 4
1973
ALL
R46N-.035
5
30
15634278
-
600D 4
1974
ALL
R45NS-.035
5
30
15634278
10°
-
600D 4
1975
ALL
R45NSX-.060
-
-
-
-
600D
1- BTDC - Before top dead center
2- D- Drive      N- neutral 
4 - When making adjustments, air
conditioner must be turned off 
(if equipped). Also, hose must be 
disconnected at vacuum release 
cylinder. The hot idle compensator
must be closed; this can be done
by pressing finger or eraser end
of pencil on compensator. On 1968
units, compensator pin is just in
front primary throttle bores; on 
1967 compensator is located in air 
horn vent stack just to left rear
of secondary metering rod hanger;
on 1966 units brass valve located
in secondary side of unit.
On 1966 models, to set stator blades for proper performance, remove pink wire from contact fitting on transmission downshift switch and connect to white wire fitting with alligator clip; this will activate stator switch.
5 - Turn adjusting screw in
Clockwise until engine misfires,
then turn screw out 1/2 turn

6 - If equipped, adjust idle speed 
with air conditioner turned on. 
Also, the vacuum released parking 
brake hose from switch to engine 
must be disconnected and opening
taped closed to prevent any air leak