{"product_id":"ac-41993-iridium-professional-spark-plug-4-box-603-419934","title":"ACDelco 41-993 Iridium Spark Plug — 4-Pack | MerCruiser GM V6 Marine Engines","description":"\u003ch2\u003eACDelco Iridium Professional Spark Plugs for MerCruiser \u0026amp; GM V6 Marine Engines\u003c\/h2\u003e\u003cp\u003eThe ACDelco 41-993 Iridium Professional spark plug is the OEM-specified iridium plug for MerCruiser and GM V6-based marine engines. The fine-wire iridium electrode delivers a more focused spark for improved combustion efficiency, smoother idle, and quicker throttle response. Sold as a 4-pack — a complete set for a 4-cylinder engine or half a set for a V8.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser GM V6 marine engines requiring ACDelco 41-993 spark plug\u003c\/li\u003e\n\u003cli\u003eGM V6-based marine engines — MerCruiser, Crusader, and Indmar applications (verify OEM plug number before ordering)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFine-wire iridium center electrode for precise, consistent spark\u003c\/li\u003e\n\u003cli\u003eOEM-specified plug for MerCruiser GM V6 applications\u003c\/li\u003e\n\u003cli\u003eReduced ignition system voltage demand — extends the life of coils, wires, and ignition components\u003c\/li\u003e\n\u003cli\u003eImproved cold-start performance and throttle response\u003c\/li\u003e\n\u003cli\u003eLong-life iridium design for extended service intervals\u003c\/li\u003e\n\u003cli\u003eSold as a 4-pack (standard pack)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe ACDelco 41-993 is the correct iridium plug for MerCruiser GM V6 marine engines — it is a different specification than the \u003ca href=\"\/products\/ac-411104-iridium-professional-spark-plug-4-box-603-411104\"\u003eACDelco 411104\u003c\/a\u003e and \u003ca href=\"\/products\/ac-411014-iridium-professional-spark-plug-4-box-603-411014\"\u003eACDelco 411014\u003c\/a\u003e, which cover different GM marine engine configurations. Using the wrong plug number can cause misfires, fouling, or ignition damage, so always cross-reference your engine’s OEM part number before ordering. The iridium upgrade is particularly worthwhile on marine engines because the lower voltage demand reduces wear on coils and wires — components that are more expensive and harder to service on the water. For the OEM Mercury Quicksilver equivalent, see the \u003ca href=\"\/products\/mercury-mercruiser-quicksilver-spark-plug-ac-41-993-884019001\"\u003eMercury MerCruiser Quicksilver Spark Plug (AC 41-993)\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250814418980,"sku":"603-419934","price":37.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/603-41110-1_497477f6-0b71-4caa-8640-3020956a3b8f.jpg?v=1786510597","url":"https:\/\/marisolmarine.com\/products\/ac-41993-iridium-professional-spark-plug-4-box-603-419934","provider":"Marisol Marine Company","version":"1.0","type":"link"}