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GReddy Spark Plugs use NGK heat range codes, so the larger the number the colder the heat range.
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ISO (International Standards Organization) - The ISO height for a spark plug from the seat to the top of the terminal nut is 50.5mm
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JIS (Japanese Industrial Standard) - The JIS height for a spark plug from the seat to the top of the terminal nut is 53mm
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L (Long Reach) - The L is similar to the ISO, however the treaded reach is 26.5mm instead of the normal reach of the ISO and JIS of 19mm
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