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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
.025
min 5
.025
min 5
1959-62 All .035
4
30 18436572
1
.025
min 5
.025
min 5
1963-64 All .035
4
30 18726543
1
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