Mopar 318 Ignition upgrade

l6hmus said

A canister style coil requires from 1.0 to 1.5 ohms to survive without overheating. But the MSD has resistance 0.700 ohm.

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The MSD ballast has a resistance of 0.7 or 0.8 ohms ONLY when it is COLD. When you start the system, then the resistance will rise into the 1.5 to 2 ohm range with 30 seconds to a minute. The MSD ballast will be fine to with a coil resistance of around 1.5 ohms. The original Chrysler ballast was 0.5 to 0.6 ohms COLD and worked fine with a coil resistance of 1.5 ohms. (Like Del listed above.)

Advance Auto and other box stores sometimes stock the Pertronix Flamethrower coils PN 40001 or 40011 that works fine with the MSD or original Chrysler ballast.