{"product_id":"acl-bmw-n63b44-s63b44-4-4l-v8-standard-size-main-bearings-1","title":"ACL BMW N63B44 S63B44 4.4L V8 HX Standard Main Bearing Set","description":"\u003cp\u003eACL Race Series 5M1573HX-STD is a standard-size main bearing set with the HX extra-clearance configuration for BMW N63B44 and S63B44 4.4-liter V8 engines. Match the exact part number, engine version, crankshaft dimensions, housing bore, and required oil clearance before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eACL Race Series performance main bearing set\u003c\/li\u003e\n\u003cli\u003eStandard-size HX configuration with additional oil clearance\u003c\/li\u003e\n\u003cli\u003e64.961 to 64.990 mm published shaft range by bearing position\u003c\/li\u003e\n\u003cli\u003e70.000 to 70.019 mm published housing range\u003c\/li\u003e\n\u003cli\u003eExact manufacturer part number 5M1573HX-STD\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2009-2012\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e750i\u003c\/td\u003e\n\u003ctd\u003eConfirm N63 engine and measured clearances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003eConfirm S63 engine and measured clearances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2012-2018\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003eConfirm S63 engine and measured clearances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011-2013\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eX5\u003c\/td\u003e\n\u003ctd\u003eConfirm N63 or S63 engine and measured clearances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2018\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eX5\u003c\/td\u003e\n\u003ctd\u003eConfirm N63 or S63 engine and measured clearances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eACL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e5M1573HX-STD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003ctd\u003eCrankshaft main bearing set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eRace Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClearance\u003c\/th\u003e\n\u003ctd\u003eHX extra-clearance configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGTIN\u003c\/th\u003e\n\u003ctd\u003e9315726470237\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOne ACL 5M1573HX-STD main bearing set in the manufacturer package. Related rod bearings, thrust components, seals, fasteners, lubricants, and machine work are not included unless expressly stated.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout ACL\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eACL manufactures engine bearings for replacement, performance, and motorsport engine builds. Bearing selection requires exact part-number matching and measured assembly clearances rather than vehicle fitment alone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRelated ACL Products\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/acl-nissan-vr38dett-3799cc-v6-dohc-4v-twin-turbo-standard-size-high-performance-main-bearing-set\"\u003eACL VR38DETT main bearing set\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/acl-mitsubishi-6g72-6g72t-6g73-main-bearings-standard-size\"\u003eACL 6G72 main bearing set\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/acl-honda-j35-3471cc-v6-sohc-4v-standard-size-race-series-main-bearing-set\"\u003eACL J35 main bearing set\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/acl\"\u003eShop all ACL products\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does HX mean on ACL 5M1573HX-STD?\u003c\/strong\u003e\u003cbr\u003eHX identifies the extra-clearance version. A qualified engine builder must measure the crankshaft, housing, and assembled oil clearance before installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes BMW vehicle fitment alone confirm this bearing set?\u003c\/strong\u003e\u003cbr\u003eNo. Confirm the exact N63 or S63 engine version, crankshaft, journal dimensions, housing bore, bearing position, and required clearance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this bearing set be installed without machine-shop measurements?\u003c\/strong\u003e\u003cbr\u003eNo. Every journal, housing bore, bearing position, and assembled oil clearance must be checked with calibrated tools before final assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation Instructions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHave a qualified engine builder inspect and measure the crankshaft and housing. Clean every oil passage and bearing seat, verify bearing orientation and oil-hole alignment, measure assembled oil clearance, follow the BMW and ACL lubrication and torque procedures, confirm free rotation, and prime the lubrication system before startup.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":46739225837647,"sku":"ACL5M1573HX-STD","price":285.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/764a59a7fd5d74a6e75fe7b68c309554L.png?v=1789012685","url":"https:\/\/www.blackopsautoworks.com\/products\/acl-bmw-n63b44-s63b44-4-4l-v8-standard-size-main-bearings-1","provider":"Black Ops Auto Works","version":"1.0","type":"link"}