Straight from "the horse's mouth?" I have spoken with the tech guys at Pertronix many times. That is not what they told me, nor is it what they put in writing. You did not specify which version of Pertronix you are talking about.
Standard Pertronix: copper plug wires are fine. If a 4 or 6 cylinder engine, coil primary resistance MUST be 3 ohms or more - or the unit will fail.
Pertronix II : copper plug wires are fine. Coil primary resistance can be as low as .45 of an ohm.
Pertrnonix III: MUST use resistance wires. Coil primary resistance can be as low as .32 of an ohm.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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