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Prices may varyThis product ranks #16 of 28 in Spark Plug.Three above it ↓
Last reviewed June 24, 2026
TL;DR The LTR5AHX is a ruthenium-alloy cross-reference to the GM OE ACDelco 41-114 for the EcoTec3 trucks, rated 100,000+ miles. It ships at 0.043 in; re-gap to the 0.040 in GM spec.
The LTR5AHX uses a 0.4mm ruthenium-alloy center electrode and a 0.8mm platinum fine-wire ground in NGK's DFE design, heat range 5, M14x1.25 taper-seat thread. It crosses to the ACDelco 41-114 on the 2014-2018 Silverado 1500 EcoTec3 4.3L/5.3L/6.2L, but NGK is not the GM OE supplier here, so it is an aftermarket upgrade, not the factory iridium part. It ships at 0.043 in against the GM 0.040 in spec, so re-gap first. NGK claims 100,000+ miles; no community removal-photo data exists yet.
Right for a 2014-2018 Silverado or Sierra 1500 owner wanting a ruthenium DFE upgrade over the factory iridium and willing to re-gap to 0.040 in. Otherwise the GM OE iridium plug is the baseline.
No chemical exposure pathway: a passive ignition part, no SDS. PGM mass is milligram-scale, offset by the long interval. Steel shell recycles as scrap; the ceramic insulator is landfilled.
Yes. The LTR5AHX (90220) is listed as a cross-reference for the 2014-2018 Silverado 1500 EcoTec3 4.3L, 5.3L, and 6.2L engines, the same application the ACDelco 41-114 covers as the GM OE plug. It also covers the matching GMC Sierra 1500, Tahoe, Suburban, and Yukon V8 applications. Confirm your engine against the NGK application guide before buying.
The GM service spec for the EcoTec3 4.3L/5.3L/6.2L is 0.040 in. The LTR5AHX ships pre-set at 0.043 in / 1.1 mm, so it needs re-gapping down to 0.040 in before installation. Use a wire feeler gauge and adjust the ground electrode gently to avoid damaging the fine-wire tip.
The ACDelco 41-114 is an iridium plug and the GM original-equipment part for this engine. The LTR5AHX uses a ruthenium-alloy center electrode with a platinum fine-wire ground in NGK's Double Fine Electrode design. Both are rated for long service life; ruthenium is NGK's newer center-electrode material. NGK is not the GM OE supplier for this engine, so the LTR5AHX is an aftermarket cross-reference, not the factory-spec plug.
Yes. The single LTR5AHX (ASIN B084RX65VD) is an Amazon add-on item, so it requires a qualifying minimum order or Subscribe & Save to buy as a standalone. Buying a full 8-plug set for a V8 EcoTec3 clears the threshold in one order.
No. The product listing does not carry a California Prop 65 warning, confirmed from the Amazon product data.
Marketing copy from NGK, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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