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BUICK
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)
Hot Idle
Std.
Tran
Auto
Tran 2
1965
V6-225
44S -.035
.016 5
30
165432
550  4
550D 4
V8-300
  10    -.035
.016 5
30
18436572
2.5°
550  4
550D 4
V8-401,425
44S -.035
.016 5
30
12784563
2.5°  6
500  4
500D 4
1966
V6-225
44S -.035
.016 5
30
165432
550  4
550D 4
V8-300,340
2 Bar. Carb
45S -.035
.016 5
30
18436572
2.5°
550  4
550D 4
V8-340
4 Bar. Carb
44S -.035
.016 5
30
18436572
2.5°
550  4
550D 4
V8-401,425
44S -.035
.016 5
30
12784563
2.5°  6
500  4
500D 4
1967
6-225 Except CA.
44S -.035 .016 5 30 165432 550 4 550D 4
6-225 CA 7
44S -.035 .016 5 30 165432 650 4
600D 4
V8-300 Except CA
10    -.035
.016 5
30
18436572
2.5°
550  4
550D 4
V8-300 CA 7
10    -.035
.016 5
30
18436572
2.5°
650  4
600D 4
8-340 Except CA
10    -.035
.016 5
30
18436572
2.5°
550  4
550D 4
8-340 CA 7
10    -.035
.016 5
30
18436572
2.5°
650  4
600D 4
8-400 Except CA
44TS-.035
.016 5
30
18436572
2.5°
500  4
500D 4
8-400 CA 7
44TS-.035
.016 5
30
18436572
2.5°
600  4
550D 4
8-430 Except CA
44TS-.035
.016 5
30
18436572
2.5°
550  4
550D 4
8-430 CA 7
44TS-.035
.016 5
30
18436572
2.5°
600  4
550D 4
1968
6-250 8  Std. tran
46N -.030 .019 32 153624 TDC Damper
700 4
N/A
6-250 8  Auto tran
46N -.030
.019
32
153624
4° Damper
N/A
600D 4
V8-350
45TS-.030
.016
30
18436572
TDC
700 4
550D 4
V8-400 
44TS-.030
.016
30
18436572
TDC
700 4
600D 4
V8-430 
44TS-.030
.016
30
18436572
TDC
N/A
550D 4
1969
 
6-250 8  Std. tran
R46N-.035
.019
32
153624
TDC Damper
700
N/A
6-250 8  Auto tran
R46N-.035
.019
32
153624
4° Damper
N/A
500D 4
V8-350
R45TS-.030
.016
30
18436572
TDC 9
700
600D
V8-400 Std. tran
R44TS-.030
.016
30
18436572
2.5° ATDC
700
N/A
V8-400 Auto tran
R44TS-.030
.016
30
18436572
TDC
N/A
600D
V8-400 G.S. Stage I 
R44TS-.030
.016
30
18436572
10°
700
600D
V8-430
R44TS-.030
.016
30
18436572
TDC
N/A
550D
1970
6-250 8
R46N-.035
.019
32
153624
12
700
550D
V8-350
R45TS-.030
.016
30
18436572
6°
700
600D
V8-455
R44TS-.030
.016
30
18436572
6°
700
600D
1971
6-250 8
R46TS-.035
.019
32
153624
4°
550
500D
V8-350 Std. tran
R45TS-.030
.016
30
18436572
6°
800
N/A
V8-350 Auto tran
R45TS-.030
.016
30
18436572
11
N/A
600D
V8-455 Std. tran
R44TS-.030
.016
30
18436572
6°
700
N/A
V8-455 Auto tran
R44TS-.030
.016
30
18436572
4°
N/A
600D
V8-455 Stage I
R44TS-.030
.016
30
18436572
10°
700
600D
1972
V8-350
R45TS-.040
.016
30
18436572
4°
800
650D
V8-455
R45TS-.040
.016
30
18436572
4°
900
650D
V8-455 Stage I
R45TS-.040
.016
30
18436572
13
900
650D
1973
6-250 8
R46T-.035
.019
31-34
153624
700
600D
V8-350
R45TS-.040
.016
30
18436572
4°
800
650D
V8-455
R45TS-.040
.016
30
18436572
4°
900
650D
V8-455 Stage I
R45TS-.040
.016
30
18436572
10°
900
650D
1974
6-250 8
R46T-.035
.019
31-34
153624
3
950
600D
V8-350
R45TS-.040
.016
29-31
18436572
4°
N/A
650D
V8-455
R45TS-.040
.016
29-31
18436572
14
N/A
650D
1975
6-250 8
R46TX-.060
-
-
-
10°
800
600D
V6-231 R44SX-.060 - - 165432
12°
800 700D
V8-260 15 R46SX-.080 - - -
16°
N/A 600D
V8-350 R45TSX-.060 - - -
12°
N/A 600D
V8-400 2b Carb 16 R46TSX-.060 - - -
16°
N/A 650D
V8-400 4b Carb 16 R45TSX-.060 - - -
16°
N/A 650D
V8-455 R45TSX-.060 - - -
12°
N/A 600D

1 - BTDC - Before top dead center

2 - D- Drive N- neutral

3 - Manual trans.- 8° BTDC
Auto trans.- 6° BTDC

4 - A/C  turned  to full on position
 
5 - Turn adjusting screw in
Clockwise until engine misfires,
then turn screw out 1/2 turn

6 - 12° BTDC for V8-425 with two
carbs and auto trans. 

7- Air Injector reactor (A.I.R) 

8- SEE Chevrolet for service 
procedure
9- 5° BTDC for Lesabre

10- 2 Barrel 45S, 4 Barrel 44S

11- 4 barrel carbs and all 
Lesabres 4°, all other 10°

12- Std.tran TDC  Auto tran
13- Manual tran 8°, auto 10°

14-Exc. Intermediate model Stage 
I eng  4° BTDC, intermediate 
model Stage I 10°

15-SEE Oldsmobile for service 
procedure

16- SEE Pontiac for service
procedure