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CHEVY II * NOVA
 

1970-75 Tune-up Specifications
1962-64
Year Engine 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 4° - 650D
6-230
250hp 7
 R46T -.035 .019 31-34 153624 TDC 750 -
6-230
250hp 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 550D
16
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
 

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