Spark Plug Heat Range and What You Need to Know
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![Re: Spark Plugs [V-8 (1955-56)] - Packard Motor Car Information](https://packardinfo.com/xoops/html/uploads/newbb/177_4e69162b75875.jpg "Re: Spark Plugs [V-8 (1955-56)] - Packard Motor Car Information")
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