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CHEVROLET

 

1965-69 Tune-up Specifications

1970-75
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
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 475
5
450D
5
8-327
300hp
44 -.035
10
28-32 18436572 475
5
450D
5
8-396
325hp
43N -.035
10
28-32 18436572
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 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 500
5
500D
5
6-250
4
46N -.035
10
31-34 153624 700
5
600D
5
8-283
Std. eng
45 -.035
10
28-32 18436572 500
5
500D
5
8-283
4
45 -.035
10
28-32 18436572 700
5
600D
5
8-327
275hp
44 -.035
10
28-32 18436572 500
5
500D
5
8-327
275hp 14
44 -.035
10
28-32 18436572 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 500
5
500D
5
8-396
325hp 4
43N -.035
10
28-32 18436572 500
5
500D
5
8-427
390hp
43N -.035 - - 18436572 550
5
550D
5
8-427
390hp 4
43N -.035 - - 18436572 550
5
550D
5
8-427
425hp
43N -.035 - - 18436572 10° 800
5
-
1967 6-250 46N -.035 .019 31-34 153624 500
5
500D
5
6-250
4
46N -.035 .019 31-34 153624 700
6
500D
6
8-283 45 -.035 .019 28-32 18436572 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 700
6
600D
6
8-327
275hp
44 -.035 .019 28-32 18436572 500
5
500D
5
8-327
275hp 4
44 -.035 .019 28-32 18436572 700
6
600D
6
8-396
325hp
43N -.035 .019 28-32 18436572 500
5
500D
5
8-396
325hp 4
43N -.035 .019 28-32 18436572 700
5
500D
5
8-427
385hp
43N -.035 .019 28-32 18436572 550
5
550D
5
8-427
385hp 4
43N -.035 .019 28-32 18436572 700
5
550D
5
1968 6-
250hp 7
46N -.035 .019 31-34 153624 TDC 700
6
-
6-
250hp 8
46N -.035 .019 31-34 153624 - 600D
5
8-307 45S -.035 .019 28-32 18436572 700
6
600D
6
8-327
250hp
44S -.035 .019 28-32 18436572 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 - 600D
6
8-396
325hp
43N -.035 .019 28-32 18436572 700
6
600D
6
8-396
375hp
43N -.035 .019 28-32 18436572 750
6
-
8-427
385hp
43N -.035 .019 28-32 18436572 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 - 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 - 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 - 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 - 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 - 600D
6
8-427
425hp
R43N -.035 .019 28-32 18436572 750
6
750D
6
8-427
335hp
R44N -.035 .019 28-32 18436572 800
6
600D
6
8-427
390hp
R43N -.035 .019 28-32 18436572 800
5
600D
5
8-427
425hp
R43N -.035 .019 28-32 18436572 750
6
750D
6
 

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