CADILLAC
1946-64 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 | |||||||
| 1946-47 | All | .030 | .016 | 21-30 | 18736542
1 |
2 |
Zero | Zero |
| 1948-51 | All | .035 | .016 | 21-30 | 18436572
1 |
3 |
Zero | Zero |
| 1952-53 | All | .035 | .0125 | 31 | 18436572
1 |
3 |
Zero | Zero |
| 1954 | All | .035 | .016 | 31 | 18436572
1 |
3 |
Zero | Zero |
| 1955 | All | .035 | .016 | 26-33 | 18436572
1 |
"A" | Zero | Zero |
| 1956-57 | All | .035 | 4 |
30 | 18436572
1 |
"A" | Zero | Zero |
| 1958 | All | .035 | 4 |
30 | 18436572
1 |
5° | .025
min 5 |
.025
min 5 |
| 1959-62 | All | .035 | 4 |
30 | 18436572
1 |
5° | .025
min 5 |
.025
min 5 |
| 1963-64 | All | .035 | 4 |
30 | 18726543
1 |
5° | Zero | Zero |
1 - Cylinders numbering front to rear: Right bank 2468 left bank 1357
2 - "IGA" or "IGN" mark
3 - "A" mark for premium fuel "C" for regular fuel
4 - Turn adjusting screw clockwise until engine begins to misfire, then back 1/2 turn
5 - Clearance between valve stem and rocker arm with hydraulic lifters collapsed and lifters on heel of cam