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Spark plug for a 1937 Buick


'72 LeSabre
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Hey, what is the correct spark plug for a 1937 Buick 320 ci? The shop manual says AC H9, which doesn't appear to have been made in a long time. I did a search and saw references to AC 46 and AC 86. What's everybody using now?

I just don't want to put ones in that are too long or too "hot".

Thanks

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