The stock heat range AC Delco Iridium is 41-101. Does anyone know the numbers of the colder plugs?
Iridium Plugs 2 ranges colder than stock:
Autolite XP104 Iridium
NGK TR7IX Iridium
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02-08-2011
The stock heat range AC Delco Iridium is 41-101. Does anyone know the numbers of the colder plugs?
Iridium Plugs 2 ranges colder than stock:
Autolite XP104 Iridium
NGK TR7IX Iridium
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