Re: Wards Spark Plugs.
I have no idea what heat range the Wards plugs are but you can get a feeling in two ways. Compare the length of the unsupported insulator on the inside of the plug with the 3X plugs. If it is longer they are hotter, if shorter they are colder. Plus you can run the plugs. If the insulator is white or light tan they have the right heat range. Black with carbon they are too cold. If the electrodes are melting they are too hot.
By the way, the vertical gap is designed to allow raw gasoline to drip away to reduce the change of flooding the plugs.
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