{"product_id":"king-engine-bearings-gm-vortex-gen-iii-iv-ls-series-main-bearing-set-2","title":"King Engine Bearings GM Vortex \/ Gen III IV LS-Series Main Bearing Set","description":"\u003cdiv\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003eMB5877SI020\u003c\/span\u003e   |   \u003cstrong\u003eUPC:\u003c\/strong\u003e 611500626814\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eKing Engine Bearings Main Bearing Set – GM LS-Series \/ Vortec (Gen III \u0026amp; IV) 0.020\" Undersize\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe King Engine Bearings Main Bearing Set is a high-performance replacement designed specifically for GM LS-Series (Gen III \u0026amp; IV) and Vortec engines. This complete set of five main bearings is manufactured to 0.020\" undersize specifications and features King’s advanced SI tri-metal material, offering superior load capacity, excellent fatigue resistance, and outstanding embeddability.\u003c\/p\u003e\n\u003cp\u003eIdeal for both street performance builds and high-output applications, these bearings deliver reliable oil film retention and smooth operation under demanding conditions. Whether you're rebuilding an LS1, LS3, LS7, LSA, or popular Vortec 4.8L\/5.3L\/6.0L\/6.2L engine, the MB5877SI020 provides the durability and precision that professional engine builders trust.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSI Tri-Metal Construction\u003c\/strong\u003e – Advanced high-performance alloy with superior strength and fatigue resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.020\" Undersize\u003c\/strong\u003e – Designed for crankshafts ground 0.020\" undersize during engine rebuilds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent Embeddability\u003c\/strong\u003e – Superior ability to absorb contaminants without damaging the crankshaft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Oil Groove Design\u003c\/strong\u003e – Provides excellent oil film retention under high loads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Machined\u003c\/strong\u003e – Tight tolerances for perfect fitment and consistent performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Load Capacity\u003c\/strong\u003e – Ideal for performance, forced-induction, and high-mileage LS engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable width=\"100%\" cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eMB5877SI020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eKing Engine Bearings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMain Bearing Set (5 Bearings)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Application\u003c\/td\u003e\n\u003ctd\u003eGM LS-Series (Gen III \u0026amp; IV) \u0026amp; Vortec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUndersize\u003c\/td\u003e\n\u003ctd\u003e0.020\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSI Tri-Metal (High-Performance Alloy)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eIsrael\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eKing Engine Bearings Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhats Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eComplete Main Bearing Set (5 main bearings)\u003c\/li\u003e\n\u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for 0.020\" undersize crankshafts in GM LS and Vortec engines\u003c\/li\u003e\n\u003cli\u003eExcellent choice for performance, boosted, and high-mileage LS builds\u003c\/li\u003e\n\u003cli\u003eProfessional installation and proper crankshaft inspection recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRequires precise crankshaft measurement and bearing clearance verification\u003c\/li\u003e\n\u003cli\u003eEstimated time: 2–4 hours (during engine rebuild)\u003c\/li\u003e\n\u003cli\u003eProfessional engine builder installation strongly recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eEngine Family\u003c\/th\u003e\n\u003cth\u003eCommon Applications\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1997–2017+\u003c\/td\u003e\n\u003ctd\u003eGM\u003c\/td\u003e\n\u003ctd\u003eLS-Series (Gen III \u0026amp; IV) \u0026amp; Vortec\u003c\/td\u003e\n\u003ctd\u003eLS1, LS2, LS3, LS6, LS7, L76, L92, L99, LSA, 4.8L, 5.3L, 6.0L, 6.2L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhy Choose King Engine Bearings?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eGlobal leader in high-performance and OE-replacement engine bearings since 1960\u003c\/li\u003e\n\u003cli\u003eAdvanced SI tri-metal technology for superior durability under load\u003c\/li\u003e\n\u003cli\u003ePrecision manufacturing with tight tolerances trusted by professional engine builders\u003c\/li\u003e\n\u003cli\u003eProven performance in street, performance, and racing applications worldwide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What does the “020” in MB5877SI020 mean? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It indicates these bearings are 0.020\" undersize, designed for crankshafts that have been ground 0.020\" undersize during a rebuild.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Will these fit my LS3 or LS7 engine? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the MB5877SI020 fits all GM LS-Series Gen III and Gen IV engines, including LS3, LS7, LSA, and Vortec variants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Are these bearings suitable for boosted or high-horsepower builds? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, King’s SI material offers excellent load capacity and is popular for forced-induction LS engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Do I need to check bearing clearance? \u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, always verify proper bearing clearance during installation for optimal performance and engine longevity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e Ground UPS or FedEx\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock – ships same or next business day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Secure King Engine Bearings retail packaging\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"King Engine Bearings","offers":[{"title":"Default Title","offer_id":45119318818895,"sku":"KINGMB5877SI020","price":142.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/King_Engine_Bearings_MB5877SI020.png?v=1776861308","url":"https:\/\/www.blackopsautoworks.com\/products\/king-engine-bearings-gm-vortex-gen-iii-iv-ls-series-main-bearing-set-2","provider":"Black Ops Auto Works","version":"1.0","type":"link"}