{"product_id":"acdelco-marine-spark-plugs-mr43t-4-pack-copper-core-corrosion-resistant-marine-ignition","title":"ACDelco Marine Spark Plugs MR43T (4-Pack) — Copper Core, Corrosion-Resistant Marine Ignition","description":"\u003cp\u003e\u003cstrong\u003eACDelco MR43T marine spark plugs are four professional-grade copper-core replacement plugs built to deliver dependable ignition and corrosion resistance for jet boats, inboards, outboards, and personal watercraft.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese ACDelco Gold (Professional) marine spark plugs are engineered as high-quality aftermarket replacements that meet original-equipment fit and performance expectations. Designed to run consistently across changing loads and conditions, they combine a copper core for improved heat transfer with a ribbed suppressor seal and corrosion-resistant sheathing to reduce misfires and extend service life. Backed by General Motors manufacturing standards, the MR43T (part number 19355200) is suitable for many makes and models as well as GM marine applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these spark plugs perform in marine environments?\u003c\/h3\u003e\n\u003cp\u003eThe MR43T is built to tolerate the wide temperature swings and load changes typical in marine use. Its internal copper core transfers heat efficiently so the plug reaches and maintains optimal operating temperature, helping combustion remain stable under variable throttle conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper core supports fast heat dissipation and durability\u003c\/li\u003e\n  \u003cli\u003eRibbed suppressor seal reduces the chance of flash-over and misfire\u003c\/li\u003e\n  \u003cli\u003eNickel-chrome center electrode sheathing resists corrosive marine elements\u003c\/li\u003e\n  \u003cli\u003eManufactured to GM-level specifications for consistent fit and function\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs fit my boat or personal watercraft?\u003c\/h3\u003e\n\u003cp\u003eThe MR43T is offered as a premium aftermarket replacement that follows original-equipment dimensions and performance criteria. While it’s engineered to suit many General Motors marine applications, it’s also compatible with numerous non-GM engines—verify thread size and reach against your engine’s OEM recommendations before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSold as a convenient four-pack for multi-cylinder engines or spares\u003c\/li\u003e\n  \u003cli\u003eMeets form, fit, and function expectations for many makes and models\u003c\/li\u003e\n  \u003cli\u003eCheck part number 19355200 against your engine manual or parts diagram\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and design features extend plug life?\u003c\/h3\u003e\n\u003cp\u003eLongevity comes from a combination of internal and external construction choices. The copper core improves thermal performance, while a nickel-chrome alloy sheathing protects the center electrode from corrosion. A ribbed suppressor seal helps maintain reliable spark control over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper core for enhanced heat transfer and electrode durability\u003c\/li\u003e\n  \u003cli\u003eNickel-chrome outer sheathing to slow corrosion in humid or salty air\u003c\/li\u003e\n  \u003cli\u003eRibbed seal to reduce electrical leakage and misfire potential\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I choose and maintain these spark plugs?\u003c\/h3\u003e\n\u003cp\u003eSelect plugs by confirming the MR43T matches your engine’s thread pitch, reach, and heat range. Installation torque and regular inspection are important—clean or replace plugs based on fouling, electrode wear, or performance changes rather than a fixed calendar schedule.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify compatibility with engine specifications before purchase\u003c\/li\u003e\n  \u003cli\u003eTighten to manufacturer-recommended torque to avoid damage\u003c\/li\u003e\n  \u003cli\u003eInspect periodically for corrosion, deposits, or electrode erosion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The ACDelco MR43T four-pack is aimed at boat owners, marine technicians, and watersport enthusiasts seeking a reliable, GM-backed replacement spark plug that balances performance and value. It’s a smart choice for anyone who wants OEM-style fit and dependable ignition in jet boats, inboards, outboards, and personal watercraft, or for those stocking parts for routine maintenance and seasonal service.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are MR43T plugs compatible with non-GM marine engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes; many non-GM engines can use MR43T if thread pitch, reach, and heat range match the engine’s specifications. Always confirm compatibility first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I replace these marine spark plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Replace or inspect plugs based on visual wear, fouling, or performance decline; follow your engine’s maintenance intervals rather than a fixed time alone.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ACDelco","offers":[{"title":"Default Title","offer_id":67593256829113,"sku":"B0G6PW6BQQ","price":59.46,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/acdelco-mr43t-front-packaging_5047c8c5-01f7-4956-999f-65e3d98b6e28.jpg?v=1790573650","url":"https:\/\/redleafauto.ca\/products\/acdelco-marine-spark-plugs-mr43t-4-pack-copper-core-corrosion-resistant-marine-ignition","provider":"Redleaf Auto","version":"1.0","type":"link"}