1946-64 Cadillac Tune-up Specifications

CADILLAC

1946-64 Tune-up Specifications

Year	Engine or Car Model	Spark Plug Gap	Point Gap	Dwell Angle	Firing Order	Ignition Timing (BTDC or Mark)	Valve Lash
Year	Engine or Car Model	Spark Plug Gap	Point Gap	Dwell Angle	Firing Order	Ignition Timing (BTDC or Mark)	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