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Prices may varyThis product ranks #22 of 28 in Spark Plug.Three above it ↓
Last reviewed July 2, 2026
TL;DR Aftermarket cross-reference for the ACDelco 41-114, the OE plug on the EcoTec3 4.3L LV3, 5.3L L84, and 6.2L L87 in the 2019-2026 Sierra 1500. Iridium center electrode, platinum ground, tapered seat, heat range NGK 5. Sells as a 4-pack; no service interval is disclosed on the listing.
NGK Laser Iridium series: iridium fine-wire center electrode, platinum-tipped ground, heat range 5 (equivalent to Denso/ACDelco heat range 16), tapered seat, 14mm thread, 0.044 in pre-set gap. It cross-references to the ACDelco 41-114 (GM 12622441) for the EcoTec3 truck V-engines in the 2019-2026 Sierra 1500 T1XX. The hotter heat range suits the direct-injection EcoTec3 application. The listing does not disclose a rated service interval. Note: the 2.7L L3B turbo-four in the T1XX Sierra uses a different plug; the 3.0L Duramax diesel has no spark plugs.
Right pick for a 2019-2026 Sierra 1500 with a EcoTec3 V-engine where the ACDelco 41-114 is unavailable or you prefer the NGK cross. Skip if your truck has the 2.7L turbo-four or 3.0L Duramax, or if your engine takes a different heat range or seat type.
No chemical exposure pathway: a passive ceramic-and-steel part with no SDS. The steel shell recycles as ferrous scrap; the ceramic insulator goes to landfill. No take-back program as of 2026.
The ILTR5E-11 (NGK stock 91418) is an aftermarket cross-reference for the ACDelco 41-114 (GM 12622441), which is the OE iridium plug for the EcoTec3 engine family in GM trucks. That includes the 4.3L LV3 V6, 5.3L L83/L84 V8, and 6.2L L86/L87 V8 in the 2019-2026 GMC Sierra 1500 T1XX and the 2014-2018 Chevrolet Silverado 1500 K2XX. If your Sierra or Silverado has the 2.7L L3B turbocharged four-cylinder, that engine requires a different plug. The 3.0L Duramax diesel has no spark plugs. Always verify your specific year, make, model, and engine against the NGK application guide before buying.
No. The OE plug for the EcoTec3 engines in the 2019-2026 Sierra 1500 T1XX is the ACDelco 41-114 (GM part number 12622441) · ACDelco is the GM OE parts supplier. The NGK ILTR5E-11 is an aftermarket iridium cross-reference for that part. It uses the same heat range (NGK 5, equivalent to Denso/ACDelco heat range 16), tapered seat, and 14mm thread, but it is not the factory-specified plug.
One per cylinder: six for the 4.3L LV3 V6, eight for the 5.3L L84 or 6.2L L87 V8. The listing (B00XCB81GO) sells as a 4-pack, so a V8 owner needs two 4-packs. Confirm the cylinder count for your specific engine before ordering.
The gap is 0.044 in (1.1 mm) for the EcoTec3 application · check against your engine service manual before installing. The plug ships pre-gapped; use a wire-style feeler gauge to verify and avoid prying on the fine iridium center electrode if an adjustment is needed.
The Amazon listing for NGK ILTR5E-11 Laser Iridium Spark Plug carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, NGK ILTR5E-11 Laser Iridium Spark Plug has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from NGK, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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