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CHEVROLET

 

1970-75 Tune-up Specifications

1965-69
Year Engine Car Model Spark Plug Type
(AC)
- Gap
PointGap Dwell Angle Firing Order Ignition Timing (BTDC or Mark)
1
Hot Idle
3
Std. Tran Auto Tran
2
1970 6-
250hp 7
R46T -.035 .019 31-34 153624 TDC 750 -
6-
250hp 8
R46T -.035 .019 31-34 153624 - 600D/ 400
8-350
250hp 7
R44 -.035 .019 28-32 18436572 TDC 750 -
8-350
250hp8
R44 -.035 .019 28-32 18436572 - 600D/ 450
8-350
300hp 7
R44 -.035 .019 28-32 18436572 TDC 700 -
8-350
300hp 8
R44 -.035 .019 28-32 18436572 - 600D
8-400
265hp 7
R44 -.035 .019 28-32 18436572 700 -
8-400
265hp 8
R44 -.035 .019 28-32 18436572 - 600D/ 450
8-454
345hp
R44T -.035 .019 28-32 18436572 - 600D
8-454
390hp
R43T -.035 .019 28-32 18436572 700 600D
1971 6-250 R46TS -.035 .019 31-34 153624 550 550D
8-350
245hp 7
R44TS -.035 .019 31-34 18436572 550 -
8-350
245hp 8
R44TS -.035 .019 31-34 18436572 - 550D
8-350
270hp
R44TS -.035 .019 31-34 18436572 - 550D
8-400
255hp 7
R44TS -.035 .019 31-34 18436572 550 -
8-400
255hp 8
R44TS -.035 .019 31-34 18436572 - 550D
8-400
300hp
R44TS -.035 .019 31-34 18436572 - 600D
8-454
365hp
R43TS -.035 .019 31-34 - 600D
1972 6-250 R46T -.035
10
31-34 153624 700 600D
8-350 R44T -.035
10
29-31 18436572 - 600D
8-400 R44T -.035
10
29-31 18436572 - 600D
8-402 R44T -.035
10
29-31 18436572 - 600D
8-454 R44T -.035
10
29-31 18436572 - 600D
1973 6-250 R46T -.035
10
31-34 153624 700 600D
8-350
145hp
R44T -.035
10
29-31 18436572 - 600D
8-350
175hp
R44T -.035
10
29-31 18436572 12° - 600D
8-400 R44T -.035
10
29-31 18436572 - 600D
8-454 R44T -.035
10
29-31 18436572 10° - 600D
1974 8-350
145hp
R44T -.035
10
29-31 18436572 - 600D
8-350
160hp
R44T -.035
10
29-31 18436572 - 600D
8-400 R44T -.035
10
29-31 18436572 - 600D
8-454 R44T -.035
10
29-31 18436572 10° - 600D
1975 8-350
2 bar carb
R44TX -.060 - - 18436572 - 600D
8-350 R44TX -.060 - - 18436572
13
- 600D
8-400 R44TX -.060 - - 18436572 - 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