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CHEVELLE 15

 

1970-75 Tune-up Specifications

1965-69
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
6-250 7
R46T -.035
.019 31-34 153624
TDC
750
-
6-250 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 7
R44 -.035
.019
28-32
18436572
TDC
700
-
8-350 8
R44 -.035
.019
28-32
18436572
4°
-
600D
8-400 265hp 7
R44 -.035
.019
28-32
18436572
4°
700
-
8-400 265hp 8
R44 -.035
.019
28-32
18436572
8°
-
600D
8-400 330hp
R44T -.035
.019
28-32
18436572
4°
700
600D
8-396 350hp 7
R44T -.035
.019
28-32
18436572
TDC
700
-
8-396 350hp 8
R44T -.035
.019
28-32
18436572
4°
-
600D
8-396 375hp
R43T -.035
.019
28-32
18436572
4°
750
700D
8-454 390hp
R43T -.035
.019
28-32
18436572
6°
700
600D
8-454 450hp
R43T -.035
.019
28-32
18436572
4°
700
600D
1971
6-250 
R46TS -.035 .019 31-34 153624
4°
550
500D
8-307 7
R45TS -.035
.019
29-31
18436572
4°
550
-
8-307 8
R45TS -.035
.019
29-31
18436572
8°
-
500D
8-350 245hp 7
R45TS -.035
.019
29-31
18436572
2°
600
-
8-350 245hp 8
R45TS -.035
.019
29-31
18436572
6°
-
600D
8-350 270hp 7
R44TS -.035
.019
29-31
18436572
4°
600
-
8-350 270hp 8
R44TS -.035
.019
29-31
18436572
8°
-
600D
8-400
R44TS -.035
.019
29-31
18436572
8°
600
600D
8-454 365hp
R43TS -.035
.019
29-31
18436572
8°
600
600D
8-454 450hp 7
R44TS -.035
.019
29-31
18436572
8°
700
-
8-454 450hp 8
R44TS -.035
.019
29-31
18436572
12°
-
700D
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 175hp 7
R44T -.035
10
29-31
18436572
4°
800
-
8-350 175hp 8
R44T -.035
10
29-31
18436572
8°
-
600D
8-402
R44T -.035
10
29-31
18436572
8°
750
600D
8-454
R44T -.035
10
29-31
18436572
8°
750
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
8-454 245hp
R44T -.035
10
29-31
18436572
10°
900
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
11
-
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
8-400
R44T -.035
10
29-31
18436572
8°
-
600D
8-454
R44T -.035
10
29-31
18436572
10°
800
600D
1975
6-250
R46TX -.060
- -
153624
8°
850
600D
6-250 11
R46TX -.060 - - 153624
10°
850
550D16
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
8-400
R44TX -.060
- -
18436572
8°
-
600D
8-454
R44TX -.060
- -
18436572
16°
-
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