Correct Ballast resistor

This is the ballast resistor I got from a NAPA store. The application? 1970 Charger with a 318.

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Fifteen bucks. Cold, it tests at .7 ohms.

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I'm told that once it warms up, that number should read .5 ohms. I haven't tested it hot though.
1970 Charger would be for points. There might be .1 ohms in meter leads. Its difficult to get super precise with a standard meter at these low resistances. Looks like all of the 70 engines have the same spec.
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Like you posted, the compensating resistor was about the same for the ECU equiped engines. see MTSC 1972 Browse MTSC by Model Year – 1972 – MyMopar