The NGK Iridium IX is a set of four high-performance spark plugs with a 0.6 mm iridium center electrode and a tapered ground electrode. The fine iridium tip ignites the mixture more easily than a conventional nickel plug, and the tapered ground electrode lets the flame kernel expand faster. NGK's heat range design suits boosted and high-revving engines, and iridium plugs resist fouling better than copper or platinum plugs, so a colder range can be run with less risk. This set is aimed at the Ecotec LSJ, with heat range chosen by pulley size. Enthusiasts rate it highly for smooth running and long service life; the trade-offs are the fragile tip and the need to gap carefully.
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Buyers rate the set very highly, praising smooth running and reliable performance in boosted Ecotec applications. Complaints center on the fragile tip and the care needed when gapping.
NGK Iridium IX spark plugs are high-performance plugs sold as a set of 4. Each has a 0.6 mm iridium center electrode tip and a tapered ground electrode. The tapered electrode increases flame kernel expansion.
The plugs are designed for acceleration, fuel efficiency and long life. Iridium plugs burn clean, so a cooler heat range can be used without the usual risk of plug fouling. This listing is for the Ecotec LSJ, and the plugs come with a .033 gap.
The iridium tip is delicate. Use a proper gapping tool that doesn't put pressure on the tip when changing the gap, or the tip can break off.
