Solid wire ignition

The solid wires I've seen personally are not stranded and of course, not to be bent back and forth too much. Lower resistance wires provide more voltage to the plug so the gap can be increased which can make more power or running and starting reliability improved. I've only run them in a spiral config (typically around a thin, fiberglass stranded core) for the emf and they are also solid wire/not stranded. I usually assemble using the accell super stock kit and blue max when they were available.