1946-1949 1947 Cadillac tuneup specs

[BryanM]

Wondering if anyone could help me with tuneup specs on a 1947 Cadillac flathead. I don't have a shop manual handy. Looking for spark plug gap, timing info etc.. thanks
Bryan

[Warren Rauch #4286]

 from 42-48 shop manuals 

     Plugs .028-.033 use wire type gauge,not feeler gauge
     Points .0125- .0175 ( .013-.018 in 48 book)
     Timing points start to open 5 degrees before top dead center
     dwell 31 degrees +/- 2 degrees
     Dist advance Manual  20 degrees
                  Automatic 21-24 Degrees
                  Vacuum  18 degrees
From Carter Carb

   Float 9/64
   Idle Adjustment 1/2 to 1 1/2 turns open

Warren

[Jeff Rosansky CLC #28373]

from 42-48 shop manuals 

     Plugs .028-.033 use wire type gauge,not feeler gauge
     Points .0125- .0175 ( .013-.018 in 48 book)
     Timing points start to open 5 degrees before top dead center
     dwell 31 degrees +/- 2 degrees
     Dist advance Manual  20 degrees
                  Automatic 21-24 Degrees
                  Vacuum  18 degrees
From Carter Carb

   Float 9/64
   Idle Adjustment 1/2 to 1 1/2 turns open

Warren

Ok, gotta ask. Why a wire feeler gauge for the plugs?
Any idea?
Thanks

[Big Fins]

Wire type gives the more accurate gap setting. Look at the negative electrode on a spark plug. The very end tip has a slight hook on the side where the spark would be. A flat feeler gauge would give you a slightly wider gap, where dragging the wire through, it falls off of the center electrode before totally clearing the gap setting.