They're copper.
T is the reach/size/thread/gasket. R means resistor, 5 is the heat range, 5 is pregapped to 0.59", and the suffix is the plug type. No suffix is copper core, thus V power, GP is platinum, IX is iridium.
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09-28-2012
They're copper.
T is the reach/size/thread/gasket. R means resistor, 5 is the heat range, 5 is pregapped to 0.59", and the suffix is the plug type. No suffix is copper core, thus V power, GP is platinum, IX is iridium.
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