Re: Coil question
The old originals likely had dioxin oil or something equally nasty inside to act as an insulator. The modern reproductions are more likely to be made with the same internal construction and materials as any 1.5-Ohm primary cylindrical can type coil. The can type coils generally don't need a ballast on 6-volt as long as they are no more than 1.5-Ohm. The later type coils for early V8 engines do need a ballast due to the design of the coil core and the way the coil windings had to be arranged around it internally. When they went back to the can types in 1948/49 they didn't need to use a ballast.
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