CHECKER MOTORS
1968-74 Tune-up Specifications
| Year | Engine Car Model | Spark Plug Gap | Point Gap | Dwell Angle | Firing Order | Ignition Timing (BTDC or Mark | Valve Lash | |
| Intake | Exhaust | |||||||
| 1968 | 6-230
Std tran |
.035 | 1 |
31-34 | 153624 | TDC | - | - |
| 6-230
Auto tran |
.035 | 1 |
31-34 | 153624 | 4° | - | - | |
| 8-307 | .035 | 1 |
28-32 | 18436572 | 2° | - | - | |
| 8-327 | .035 | 1 |
28-32 | 18436572 | 4° | - | - | |
| 8-327
2 |
.035 | 1 |
28-32 | 18436572 | 8° | - | - | |
| 1969 | 6-250
Std tran |
.035 | 1 |
31-34 | 153624 | TDC | - | - |
| 6-250
Auto tran |
.035 | 1 |
31-34 | 153624 | 4° | - | - | |
| 8-327
Std tran |
.035 | 1 |
28-32 | 18436572 | 2° ATC | - | - | |
| 8-327
Auto tran |
.035 | 1 |
28-32 | 18436572 | 2° | - | - | |
| 8-350
215hp |
.035 | 1 |
28-32 | 18436572 | 4° | - | - | |
| 8-350
300hp |
.035 | 1 |
28-32 | 18436572 | 4° | - | - | |
| 1970 | 6-250 | .035 | 1 |
31-34 | 153624 | 4° | - | - |
| 8-350 | .035 | 1 |
28-32 | 18436572 | 4° | - | - | |
| 1971 | 6-250 | .035 | 1 |
31-34 | 153624 | 4° | - | - |
| 8-350
3 |
.035 | 1 |
29-31 | 18436572 | 6° | - | - | |
| 8-350
2 |
.035 | 1 |
29-31 | 18436572 | 4° | - | - | |
| 1972 | 6-250 | .035 | 1 |
31-34 | 153624 | 4° | - | - |
| 8-350
3 |
.035 | 1 |
29-31 | 18436572 | 6° | - | - | |
| 8-350
2 |
.035 | 1 |
29-31 | 18436572 | 8° | - | - | |
| 1973 | 6-250 | .035 | 1 |
31-34 | 153624 | 6° | - | - |
| 8-350
3 |
.035 | 1 |
29-31 | 18436572 | 8° | - | - | |
| 8-350
2 |
.035 | 1 |
29-31 | 18436572 | 12° | - | - | |
| 1974 | 6-250 | .035 | 1 |
31-34 | 153624 | 6° | - | - |
| 8-350 | .035 | 1 |
29-31 | 18436572 | 8° | - | - | |
1 - New .019, used .016. On V8 Turn adjusting screw clockwise until engine begins to misfire, then back off 1/2 turn.
2- Aerobus
3- Marathon & taxi
- Hydraulic lifters