Are NGK Iridium Spark Plugs Pre-Gapped? | Gap Facts First
Most NGK iridium plugs arrive with a factory-set gap, yet you should still verify the gap matches your engine’s spec before installation. You’re holding a fresh set of NGK iridium spark plugs and wondering if you can skip the gap check. In many cases, yes—you’re starting with a plug that’s already set at the factory.
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