The Poorman's Off Chassis Restoration.Com
Car Nose Logo
Photo Gallery
Web Cam
Specs
Cost
Links
Raffle
Pin-ups
Erudition
Contact
Store
Home
IPC
Video
Parts
Comedy
Destructive Tests
CHEVROLET
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
6-250 7
R46T -.035
.019 31-34 153624 TDC
750
-
6-250 8
R46T -.035 .019 31-34 153624
4°
-
600D/
400
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
8-400 265hp 7
R44 -.035
.019
28-32
18436572
4°
700
-
8-400 265hp 8
R44 -.035
.019
28-32
18436572
8°
-
600D/
450
8-454 345hp
R44T -.035
.019
28-32
18436572
6°
-
600D
8-454 390hp
R43T -.035
.019
28-32
18436572
6°
700
600D
1971
6-250 
R46TS -.035 .019 31-34 153624
4°
550
550D
8-350 245hp 7
R44TS -.035
.019
31-34
18436572
2°
550
-
8-350 245hp 8
R44TS -.035
.019 31-34
18436572
6°
-
550D
8-350 270hp
R44TS -.035
.019
31-34
18436572
8°
-
550D
8-400 255hp 7
R44TS -.035
.019 31-34
18436572
4°
550
-
8-400 255hp 8
R44TS -.035
.019
31-34
18436572
8°
-
550D
8-400 300hp
R44TS -.035
.019 31-34
18436572
8°
-
600D
8-454 365hp
R43TS -.035
.019
31-34
 
8°
-
600D
1972
6-250 
R46T -.035 10 31-34 153624
4°
700
600D
8-350
R44T -.035
10
29-31
18436572
6°
-
600D
8-400
R44T -.035
10
29-31
18436572
6°
-
600D
8-402
R44T -.035
10
29-31
18436572
8°
-
600D
8-454
R44T -.035
10
29-31
18436572
8°
-
600D
1973
6-250 
R46T -.035 10 31-34 153624
6°
700
600D
8-350 145hp
R44T -.035
10
29-31
18436572
8°
-
600D
8-350 175hp
R44T -.035
10
29-31
18436572
12°
-
600D
8-400
R44T -.035
10
29-31
18436572
8°
-
600D
8-454
R44T -.035
10
29-31
18436572
10°
-
600D
1974
8-350 145hp
R44T -.035
10
29-31
18436572
8°
-
600D
8-350 160hp
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°
-
600D
1975
8-350 2 bar carb
R44TX -.060
- -
18436572
6°
-
600D
8-350 
R44TX -.060
- -
18436572
8° 13
-
600D
8-400
R44TX -.060
-
-
18436572
8°
-
600D
8-454
R44TX -.060
-
-
18436572
16°
-
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