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CHEVROLET
1965-69 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 3
Std.
Tran
Auto
Tran 2
1965
6-230 
44N -.035
10 31-34 153624 500 5 475D 5
8-283 195hp
45 -.035
10
28-32
18436572
500  5
475D 5
8-283 4 bar carb
45 -.035
10
28-32
18436572
500  5
475D 5
8-327 250hp
44 -.035
10
28-32
18436572
4°
475  5
450D 5
8-327 300hp
44 -.035
10
28-32
18436572
8°
475  5
450D 5
8-396 325hp
43N -.035
10
28-32
18436572
4° 17
500  5
475D 5
8-396 425hp
43N -.035
10
28-32
18436572
10°
800  5
-
8-409 340hp
C42N-.035
10
28-32
18436572
8°
475  5
450D 5
8-409 400hp
C42N-.035
10
28-32
18436572
12°
975  5
-
1966
6-250 Std. eng
46N -.035
10
31-34
153624
6°
500 5 500D 5
6-250 4
46N -.035 10 31-34 153624
6°
700 5
600D 5
8-283 Std. eng
45 -.035
10
28-32
18436572
4°
500  5
500D 5
8-283 4
45 -.035
10
28-32
18436572
4°
700  5
600D 5
8-327 275hp
44 -.035
10
28-32
18436572
8°
500  5
500D 5
8-327 275hp 14
44 -.035
10
28-32
18436572
8°
700  5
-
8-327 275hp 18
44 -.035
10
28-32
18436572
2° ATC
-
600D 5
8-396 325hp
43N -.035
10
28-32
18436572
4°
500  5
500D 5
8-396 325hp 4
43N -.035
10
28-32
18436572
4°
500  5
500D 5
8-427 390hp
43N -.035
-
-
18436572
4°
550  5
550D 5
8-427 390hp 4
43N -.035
-
-
18436572
4°
550  5
550D 5
8-427 425hp
43N -.035
-
-
18436572
10°
800  5
-
1967
6-250
46N -.035
.019
31-34
153624
4°
500 5 500D 5
6-250 4
46N -.035 .019 31-34 153624
4°
700 6
500D 6
8-283 
45 -.035
.019
28-32
18436572
4°
500  5
500D 5
8-283 4, 7
45 -.035
.019
28-32
18436572
TDC
700  6
600D 6
8-283 4, 8
45 -.035
.019
28-32
18436572
4°
700  6
600D 6
8-327 275hp
44 -.035
.019
28-32
18436572
8°
500  5
500D 5
8-327 275hp 4
44 -.035
.019
28-32
18436572
6°
700  6
600D 6
8-396 325hp
43N -.035
.019
28-32
18436572
4°
500  5
500D 5
8-396 325hp 4
43N -.035
.019
28-32
18436572
4°
700  5
500D 5
8-427 385hp
43N -.035
.019
28-32
18436572
4°
550  5
550D 5
8-427 385hp 4
43N -.035
.019
28-32
18436572
4°
700  5
550D 5
1968
6-250 7
46N -.035
.019 31-34 153624 TDC
700 6
-
6-250 8
46N -.035 .019 31-34 153624
4°
-
600D 5
8-307
45S -.035
.019
28-32
18436572
2°
700 6
600D 6
8-327 250hp
44S -.035
.019
28-32
18436572
4°
700  5
600D 6
8-327 275hp 7
44 -.035
.019
28-32
18436572
TDC
700  5
-
8-327 275hp 8 
44 -.035
.019
28-32
18436572
4°
-
600D 6
8-396 325hp
43N -.035
.019
28-32
18436572
4°
700  6
600D 6
8-396 375hp
43N -.035
.019
28-32
18436572
4°
750 6
-
8-427 385hp
43N -.035
.019
28-32
18436572
4°
700  6
600D 6
1969
 
6-250 7
R46N -.035
.019 31-34 153624
TDC
700 6
-
6-250 8
R46N -.035 .019 31-34 153624
4°
-
550D 6
8-327 235hp 7
R45S -.035
.019
28-32
18436572
2° ATC
700  6
-
8-327 235hp 8 
R45S -.035
.019
28-32
18436572
2°
-
600D 6
8-350 255hp 7
R44 -.035
.019
28-32
18436572
TDC
700 6
-
8-350 255hp 8
R44 -.035
.019
28-32
18436572
4°
-
600D 6
8-350 300hp 7
R44 -.035
.019
28-32
18436572
TDC
700 6
-
8-350 300hp 8
R44 -.035
.019
28-32
18436572
4°
-
600D 6
8-396 265hp 7
R44N -.035
.019
28-32
18436572
TDC
700 6
-
8-396 265hp 8
R44N -.035
.019
28-32
18436572
4°
-
600D 6
8-427 425hp
R43N -.035
.019
28-32
18436572
4°
750  6
750D 6
8-427 335hp
R44N -.035
.019
28-32
18436572
4°
800  6
600D 6
8-427 390hp
R43N -.035
.019
28-32
18436572
4°
800  5
600D 5
8-427 425hp
R43N -.035
.019
28-32
18436572
4°
750  6
750D 6

1970-75

ATC- After top center

TDC-  Top dead center

1- BTDC - Before top dead center
2- D- Drive

3 - Where two speeds are listed,
lower speed indicates idle
solenoid disconnected.

4 -  With Air Injection reactor
emission system  (A.I.R)
5 - With A/C on

6 - With A/C off

7- Std. tranny

8- Auto tranny

9- Marketed as 396 but 
actually 402 cu.in.
10- New .019, used .016
Turn adjusting screw in
Clockwise until engine misfires,
then turn screw out 1/2 turn

11- With integral intake 
manifold and all CA models

12- CA 4° BTDC

13- CA 6° BTDC
14- Manual trans and Air
Injection reactor system

15- Also Monte Carlo

16- CA 600 rpm

17- Transistor Ign 6° BTDC

18-Auto tranny and Air
Injection reactor system