{"product_id":"acl-bmw-n63-s63-v8-4395cc-25mm-oversized-high-performance-rod-bearing-set-8b1578h-25","title":"ACL BMW N63\/S63 V8 4395cc .25mm Oversized High Performance Rod Bearing Set | 8B1578H-.25","description":"\u003cp\u003eThis ACL High Performance Rod Bearing Set is machined .25mm (0.010in) undersize, built for the BMW N63B44 4.4L (4395cc) twin-turbo V8 whose connecting rod journals have been reground to accept it. It fits the BMW 550i, 550i GT, 650i, 750Li, M6, X5 xDrive50i, and X6 xDrive50i.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: Rod Bearing Set\u003c\/li\u003e\n\u003cli\u003eSeries: High Performance\u003c\/li\u003e\n\u003cli\u003eSize: .25mm (0.010in) Undersize\u003c\/li\u003e\n\u003cli\u003eEngine Fitment: BMW N63B44 4.4L (4395cc) V8\u003c\/li\u003e\n\u003cli\u003eVehicle Platform: BMW 550i\/550i GT, 650i, 750Li, M6, X5 xDrive50i, X6 xDrive50i\u003c\/li\u003e\n\u003cli\u003ePart Number: 8B1578H-.25\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does .25mm undersize mean for this rod bearing?\u003c\/h5\u003e\u003cp\u003eIt means the bearing is sized .25mm (0.010in) smaller in bore to match a connecting rod journal that has been reground to that dimension.\u003c\/p\u003e\u003ch5\u003eWhat engine displacement is this rod bearing set for?\u003c\/h5\u003e\u003cp\u003eIt's built for the BMW N63B44 4.4L (4395cc) twin-turbo V8.\u003c\/p\u003e\u003ch5\u003eWhich BMW models use this rod bearing set?\u003c\/h5\u003e\u003cp\u003eIt fits the BMW 550i, 550i GT, 650i, 750Li, M6, X5 xDrive50i, and X6 xDrive50i.\u003c\/p\u003e\u003ch5\u003eIs this the same size as the .025mm version?\u003c\/h5\u003e\u003cp\u003eNo - this is a larger .25mm regrind size, distinct from the smaller .025mm oversized option.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does .25mm undersize mean for this rod bearing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It means the bearing is sized .25mm (0.010in) smaller in bore to match a connecting rod journal that has been reground to that dimension.\"}},{\"@type\":\"Question\",\"name\":\"What engine displacement is this rod bearing set for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for the BMW N63B44 4.4L (4395cc) twin-turbo V8.\"}},{\"@type\":\"Question\",\"name\":\"Which BMW models use this rod bearing set?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It fits the BMW 550i, 550i GT, 650i, 750Li, M6, X5 xDrive50i, and X6 xDrive50i.\"}},{\"@type\":\"Question\",\"name\":\"Is this the same size as the .025mm version?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No - this is a larger .25mm regrind size, distinct from the smaller .025mm oversized option.\"}}]}\u003c\/script\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":42631473397808,"sku":"ACL8B1578H-.25","price":392.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/40122eef7c72ad8aedbf813a6911e74f_ba232655-47d1-489a-b05a-4475968916ac.png?v=1765198172","url":"https:\/\/berryperformancesales.com\/products\/acl-bmw-n63-s63-v8-4395cc-25mm-oversized-high-performance-rod-bearing-set-8b1578h-25","provider":"Berry Performance Sales","version":"1.0","type":"link"}