The impedince in ohms must be the recommended amount for the application. There are 1.5, 3, or 6 ohm ratings, as well as the 40, 45 and 60 Killer Volt coils in common use. From here on, it gets a little hard to fathom sometimes.
Some buyers don't follow the coil rules becasue its a little hard to understand it all, or becasue they already have a coil, like in your case. It's a pretty common scenario.
The result is people tend to have problems with the dwell adjustment at idle with the the Pertronix II. In some applications with the Pertronix I , such as under hard running, there has been a change in the recomendations in the latest Pertronix catalogue.
You have to check page 46 to 49 of the 64 page catalogue, and check the recomendations.
I had no idea what coil to get so I got the people at summit to look it up while I was on the phone with them and they are sending me the flamethower coil.
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