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CHEVY II * NOVA
1970-75 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 3
Std.
Tran
Auto
Tran 2
1970
4-153 7
R46N -.035
.019 31-34 1342 TDC 750 -
4-153 8
R46N -.035
.019 31-34 1342 - 650D
6-230 250 7
R46T -.035
.019 31-34 153624
TDC
750
-
6-230 250 8
R46T -.035 .019 31-34 153624
4°
-
600D/
400
8-307 7
R43 -.035
.019
28-32
18436572
2°
700
-
8-307 8
R43 -.035
.019
28-32
18436572
8°
-
600D/
450
8-350 250hp 7
R44 -.035
.019
28-32
18436572
TDC
750
-
8-350 250hp 8
R44 -.035
.019
28-32
18436572
4°
-
600D/
450
8-350 300hp 7
R44 -.035
.019
28-32
18436572
TDC
700
-
8-350 300hp 8
R44 -.035
.019
28-32
18436572
4°
-
600D
8-396 350hp
R44T -.035
.019
28-32
18436572
TDC
700
-
8-396 375hp 7
R43T -.035
.019
28-32
18436572
4°
750
-
8-396 375hp 8
R43T -.035
.019
28-32
18436572
4°
-
700D
1971
6-250 
R46TS -.035 .019 31-34 153624
4°
550
500D
8-307 200hp 7
R45TS -.035
.019
29-31
18436572
4°
550
-
8-307 200hp 8
R45TS -.035
.019
29-31
18436572
8°
-
550D
8-350 245hp 7
R44TS -.035
.019
29-31
18436572
2°
600
-
8-350 245hp 8
R44TS -.035
.019
29-31
18436572
6°
-
550D
8-350 270hp 7
R44TS -.035
.019
29-31
18436572
4°
600
-
8-350 270hp 8
R44TS -.035
.019
29-31
18436572
8°
-
600D
1972
6-250 
R46T -.035 10 31-34 153624
4°
700
600D
8-307 Std. trans 
R44T -.035
10
29-31
18436572
4°
900
-
8-307 Auto trans 
R44T -.035
10
29-31
18436572
8°
-
600D
8-350 165hp
R44T -.035
10
29-31
18436572
6°
900
600D
8-350 200hp 7
R44T -.035
10
29-31
18436572
4°
800
-
8-350 200hp 8
R44T -.035
10
29-31
18436572
8°
-
600D
1973
6-250 
R46T -.035 10 31-34 153624
6°
700
600D
8-307 7
R44T -.035
10
29-31
18436572
4°
900
-
8-307 8
R44T -.035
10
29-31
18436572
8°
-
600D
8-350 145hp
R44T -.035
10
29-31
18436572
8°
900
600D
8-350 175hp 7
R44T -.035
10
29-31
18436572
8°
900
-
8-350 175hp 8
R44T -.035
10
29-31
18436572
12°
-
600D
1974
6-250 7 
R46T -.035
10
31-34
153624
8°
850
-
6-250 8
R46T -.035 10 31-34 153624
6°
-
600D
8-350 145hp 7
R44T -.035
10
29-31
18436572
TDC
900
-
8-350 145hp 8
R44T -.035
10
29-31
18436572
8°
-
600D
8-350 160hp 7
R44T -.035
10
29-31
18436572
4°
900
-
8-350 160hp 8
R44T -.035
10
29-31
18436572
8°
-
600D
8-350 185hp 7
R44T -.035
10
29-31
18436572
8° 12
900
-
8-350 185hp 8
R44T -.035
10
29-31
18436572
8°
-
600D
1975
6-250
R46TX -.060
- -
153624
8°
850
600D
6-250 11
R46TX -.060 - - 153624
10°
850
550D16
8-262
R44TX -.060
- -
18436572
8°
800
600D
8-350 2 bar carb
R44TX -.060
- -
18436572
6°
800
600D
8-350 7
R44TX -.060
- -
18436572
6° 12
800
-
8-350 8
R44TX -.060
- -
18436572
8° 13
-
600D
Back
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