{"product_id":"rps-iridium-spark-plugs-for-mercruiser-volvo-penta-pcm-indmar-5-0-5-7-6-2-v8-set-of-8-direct-fit-replacement","title":"RPS Iridium Spark Plugs for Mercruiser Volvo Penta PCM Indmar 5.0\/5.7\/6.2 V8 — Set of 8, Direct-Fit Replacement","description":"\u003cstrong\u003eHigh-performance iridium spark plugs engineered to replace AC Delco 41-993 and fit GM-based 5.0, 5.7, and 6.2 marine engines from 1997 onward.\u003c\/strong\u003e\n\n\u003cp\u003eIf you own a Mercruiser, Volvo Penta, PCM, or Indmar-powered boat with GM-derived 5.0, 5.7, or 6.2 engines, these RPS iridium plugs provide a direct-fit replacement that preserves factory specifications. They’re sold as a set of eight, match the AC Delco 41993 footprint and are designed for fuel-injected marine ignition systems. Built with an iridium center electrode for longer life and consistent spark performance, they’re a practical service item for seasonal tune-ups and mid-life maintenance.\u003c\/p\u003e\n\n\u003ch3\u003eWill these plugs fit my Mercruiser 350MAG or 5.0MPI engine?\u003c\/h3\u003e\n\u003cp\u003eYes — these RPS iridium plugs are compatible with Mercruiser 350MAG and 5.0MPI engines from 1997 and later, including models listed under Black Scorpion and other factory variants. They match Mercruiser part references and mounting parameters for a bolt-in replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits Mercruiser 350MAG and 5.0MPI (1997+)\u003c\/li\u003e\n  \u003cli\u003eDirect compatibility with Mercruiser part 33-8M2018369\u003c\/li\u003e\n  \u003cli\u003eSold as a set of 8 plugs for V8 applications\u003c\/li\u003e\n  \u003cli\u003eMaintains original plug reach, thread size, and heat range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these plugs compare to AC Delco 41993 or OE parts?\u003c\/h3\u003e\n\u003cp\u003eRPS plugs are manufactured to match the form, fit and function of AC Delco 41993 and other original-equipment references, so they can be used as a like-for-like replacement. The iridium tip offers longer service intervals than standard copper plugs while retaining the correct thermal characteristics for GM 5.0–6.2 engines.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEquivalent to AC Delco 41993 in dimensions and spec\u003c\/li\u003e\n  \u003cli\u003eIridium center electrode for extended life and stable spark\u003c\/li\u003e\n  \u003cli\u003eEngineered for fuel-injected ignition timing and performance\u003c\/li\u003e\n  \u003cli\u003eMeets OEM thread and seat specifications to prevent leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich Volvo Penta and PCM engines accept these spark plugs?\u003c\/h3\u003e\n\u003cp\u003eThese plugs fit a range of Volvo Penta and PCM GM-based engines beginning in 1997, covering 5.0 and 5.7 GXI\/GI family engines as well as several 6.2 variants. Cross-references include Volvo Penta part numbers cited by manufacturers for direct replacement scenarios.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Volvo Penta part numbers 21467472 and 3858996\u003c\/li\u003e\n  \u003cli\u003eFits Volvo Penta 5.0 and 5.7 GXI\/GI (1997+)\u003c\/li\u003e\n  \u003cli\u003eWorks for PCM and Indmar installations using GM-based V8s\u003c\/li\u003e\n  \u003cli\u003eAppropriate for fuel-injected marine engine calibrations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone familiar with marine V8 ignition systems: remove the old plugs, check threads and sealing surfaces, torque the new plugs to the manufacturer’s specification, and route boots properly. Regular inspection during annual service ensures optimal performance and longevity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstall using manufacturer torque specs to avoid over-tightening\u003c\/li\u003e\n  \u003cli\u003eReplace in complete sets for even combustion across cylinders\u003c\/li\u003e\n  \u003cli\u003eInspect ignition boots and coil packs while plugs are out\u003c\/li\u003e\n  \u003cli\u003eRecommended for scheduled maintenance every season or per hours\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Boaters, marine mechanics, and DIY owners running GM-derived 5.0, 5.7, or 6.2 fuel-injected marine engines who want a durable, OE-equivalent iridium replacement. If you need parts compatible with Mercruiser, Volvo Penta, PCM, Indmar, or AC Delco 41993 specifications and prefer the longer service life of iridium electrodes, this set of eight RPS plugs is a practical choice for routine tune-ups and performance-minded maintenance.\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 these RPS plugs a direct replacement for AC Delco 41993?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — they match the dimensions and specifications of AC Delco 41993 for direct replacement on compatible engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many plugs are included and for which engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This listing includes a set of eight plugs, suited for GM-based 5.0, 5.7, and 6.2 fuel-injected marine engines (1997+).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RPS","offers":[{"title":"Default Title","offer_id":48080476111006,"sku":"B0DFV34PQR","price":124.93,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/rps-front-packaging-spark-plugs.jpg?v=1785781761","url":"https:\/\/northtrailauto.ca\/products\/rps-iridium-spark-plugs-for-mercruiser-volvo-penta-pcm-indmar-5-0-5-7-6-2-v8-set-of-8-direct-fit-replacement","provider":"North Trail Auto","version":"1.0","type":"link"}