{"product_id":"mmceng7206-magnus-mclaren-iron-engine-sleeves","title":"Magnus Ductile Iron Engine Sleeves for McLaren 4.0L V8","description":"\u003cp\u003eMagnus Motorsports McLaren 4.0L ductile iron engine sleeves help resist deformation under high boost and high combustion loads. Sold as a full set of 8 sleeves.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eVehicle Fitment:\u003c\/span\u003e\u003cbr\u003eMcLaren 3.8L \u0026amp; 4.0L V8 Twin-Turbo\u003cbr\u003e• M838T: 625C, 650S, 675LT, MP4-12C, MSO 688 HS\u003cbr\u003e• M838TE: 540C, 570S, 570GT, 600LT, 620R\u003cbr\u003e• M840T: 720S, 750S, 765LT, Senna, Elva, Speedtail, Sabre\u003cbr\u003e• M840TE: GT, GTS\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e4.0L Replacement:\u003c\/span\u003e\u003cbr\u003eThese sleeves are a drop-in upgrade for the 4.0L M840T and M840TE blocks to replace the factory liners.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e3.8L Upgrade\/Stroker Kit:\u003c\/span\u003e\u003cbr\u003eThese allow builders to machine a 3.8L M838T or M838TE block out to accept the larger 4.0L bore diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003ePurchase Includes:\u003c\/span\u003e\u003cbr\u003e(8) Sleeves\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eInstall Notes:\u003c\/span\u003e\u003cbr\u003e• Professional machining and installation required.\u003cbr\u003e• Intended for built engines exceeding factory power levels.\u003cbr\u003e• Don't forget the \u003ca style=\"color: #ffffff; text-decoration: underline;\" href=\"https:\/\/stmtuned.com\/products\/mmctol0006-magnus-mclaren-sleeve-puller-and-installer\"\u003e\u003cspan style=\"color: rgb(255, 255, 0); text-decoration: underline;\"\u003eMagnus Sleeve Puller and Installer Tool\u003c\/span\u003e\u003c\/a\u003e!\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eMore from Magnus:\u003c\/span\u003e\u003cbr\u003eMagnus McLaren Engine Sleeves are engineered to address a known limitation of the factory cylinder design in high-power applications. The OEM steel sleeve, while adequate at stock power levels, has a tendency to bend under extreme cylinder pressure. Once steel bends, it often retains an out-of-round shape, compromising bore concentricity, ring seal, and long-term engine reliability.\u003c\/p\u003e\n\u003cp\u003eMagnus sleeves are manufactured from thick-wall, heavy-duty ductile iron, specifically chosen for its superior rigidity and dimensional stability. This design helps resist deformation under high boost and high combustion loads, maintaining bore shape and fighting ovalling in extreme horsepower applications.\u003c\/p\u003e\n\u003cp\u003eDesigned for serious street and motorsport engine programs, Magnus McLaren Engine Sleeves provide the foundation required when pushing well beyond factory limits.  Magnus Sleeves are finish bored to final size so they can be replaced without any additional machining!\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eFeatures:\u003c\/span\u003e\u003cbr\u003e• Heavy-duty ductile iron construction\u003cbr\u003e• Increased wall thickness for added rigidity\u003cbr\u003e• Designed to retain bore concentricity\u003cbr\u003e• Helps resist cylinder ovalling at high power levels\u003cbr\u003e• Superior stability compared to OEM steel sleeves\u003cbr\u003e• Ideal for high-boost and high-horsepower builds\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eBenefits:\u003c\/span\u003e\u003cbr\u003e• Improved ring seal\u003cbr\u003e• Increased cylinder durability\u003cbr\u003e• Enhanced long-term engine reliability\u003cbr\u003e• Critical upgrade for extreme power applications\u003c\/p\u003e","brand":"Magnus","offers":[{"title":"Default Title","offer_id":42828493455445,"sku":"MGN-MMCENG7206","price":4158.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1893\/9911\/files\/MMCENG7206-magnus-mclaren-iron-engine-sleeves-1.jpg?v=1785947627","url":"https:\/\/stmtuned.com\/products\/mmceng7206-magnus-mclaren-iron-engine-sleeves","provider":"STM Tuned Inc.","version":"1.0","type":"link"}