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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
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
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