{"product_id":"michigan-motorsports-2m4978-piston-ring-set-4-8l-5-3l-ls-stock-bore-moly-rings","title":"Michigan Motorsports 2M4978 Piston Ring Set — 4.8L \u0026 5.3L LS Stock Bore Moly Rings","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Michigan Motorsports 2M4978 piston ring set is a Hastings standard-size moly replacement kit designed for LS-family engines. It supports rebuilds and performance upgrades for 4.8L and 5.3L powerplants, including popular LS variants such as LM7, L59, LS4, LY5, LMG, LMF, LH6, LC9, and L33. This kit emphasizes a precise fit with stock bore pistons, helping you approach a rebuild with confidence and a clear path to restoration or upgrade goals.\u003c\/p\u003e\n\n\u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e3.779 inch (96 mm) bore with a 1.5 mm top ring, 1.5 mm second ring, and 3.0 mm oil ring configuration\u003c\/li\u003e\n  \u003cli\u003eStandard bore size compatibility specifically designed for stock bore LS pistons, providing a precise fit without extra machining\u003c\/li\u003e\n  \u003cli\u003eRing construction includes 1st oil ring: steel rail and stainless expansion; 2nd ring: grey iron; top ring: steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment \u0026amp; applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eEngine families: LS-based 4.8L and 5.3L platforms, including LM7, L59, LS4, LY5, LMG, LMF, LH6, LC9, and L33\u003c\/li\u003e\n  \u003cli\u003eIdeal for rebuilds and performance upgrades across daily drivers, work trucks, and applications requiring dependable piston rings\u003c\/li\u003e\n  \u003cli\u003eDesigned for stock bore with no machining needed, simplifying installation when rebuilding an LS engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMaterials \u0026amp; design\u003c\/h3\u003e\n\u003cp\u003eRings are built for durability and consistent performance: the top ring is steel, the second ring uses grey iron, and the oil ring employs a steel rail with stainless expansion. This combination aims to balance wear resistance with effective oil control under typical LS operating conditions.\u003c\/p\u003e\n\n\u003ch3\u003ePractical notes\u003c\/h3\u003e\n\u003cp\u003eWhile results depend on overall engine condition and maintenance, the Hastings 2M4978 kit provides a solid foundation for reliable compression and oil sealing during the break-in phase and subsequent miles. This kit is a practical option for technicians seeking OEM-quality components for stock-bore LS builds.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose Hastings 2M4978\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eOEM-quality Hastings rings designed for precise fit with stock bore pistons\u003c\/li\u003e\n  \u003cli\u003eStandard size configuration helps avoid machining and simplifies installation\u003c\/li\u003e\n\u003c\/ul\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: What engines does the 2M4978 kit fit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Fits 4.8L and 5.3L LS-based engines including LM7, L59, LS4, LY5, LMG, LMF, LH6, LC9, and L33.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Why choose Hastings 2M4978 piston rings?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Standard size moly rings offer a reliable seal and compatibility with stock bore pistons for LS engine rebuilds.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Michigan Motorsports","offers":[{"title":"Default Title","offer_id":42471076954197,"sku":"B08D8QXMPH","price":78.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/michigan-motorsports-2m4978-piston-ring-set-4-8l-5-3l.jpg?v=1778164635","url":"https:\/\/plentytorque.co.uk\/products\/michigan-motorsports-2m4978-piston-ring-set-4-8l-5-3l-ls-stock-bore-moly-rings","provider":"PlentyTorque","version":"1.0","type":"link"}