ACL 8B1578HX-STD High-Performance Connecting Rod Bearing Set for BMW N63/S63 V8

BMW N63B44 4.4L 4395cc V8 Connecting Rod Bearing Set - Standard with extra .025mm (0.001") oil clearance

Upgrade the bottom-end reliability of your BMW N63 or S63 V8 with the ACL 8B1578HX-STD high-performance connecting rod bearing set. Designed for standard journal sizing with an additional 0.001-inch oil clearance, this bearing set supports the lubrication demands of high-output and performance-oriented applications. It is engineered for precise fitment, dependable oil control, and consistent operation under demanding engine conditions.

ACL performance bearings are manufactured using advanced materials and construction techniques to provide improved fatigue resistance and durability compared with conventional replacement bearings. The 8B1578HX-STD set is suitable for rebuilding or servicing compatible BMW 4.4-liter, 4,395cc V8 engines, including N63 and S63 applications. The additional oil clearance can help support proper lubrication in engines requiring increased bearing clearance, but crankshaft and engine specifications should always be verified before installation.

Key Product Specifications & Technical Data

• Brand: ACL
• Part Number: 8B1578HX-STD
• Application: BMW N63/S63 V8 connecting rod bearings
• Engine Configuration: 4.4-liter, 4,395cc V8
• Bearing Size: Standard
• Additional Oil Clearance: 0.001 inch
• Product Type: High-performance connecting rod bearing set
• Quantity: One complete bearing set

What's Included

One ACL 8B1578HX-STD standard-size high-performance connecting rod bearing set with additional 0.001-inch oil clearance. Confirm crankshaft journal measurements, bearing clearances, and engine specifications before installation.

Compatible fitment includes select 2012–2018 BMW M6 models and 2015–2017 BMW X5 models equipped with applicable N63 or S63 V8 engines. Verify the vehicle year, engine code, crankshaft specifications, and required bearing clearance before ordering.

Features:

• High-performance construction: Engineered to provide dependable durability and fatigue resistance in demanding BMW V8 applications.
• Standard-size fitment: Designed for crankshafts using standard connecting rod bearing dimensions.
• Additional oil clearance: Provides an extra 0.001 inch of clearance to support lubrication requirements in applicable performance builds.
• BMW V8 compatibility: Designed for select N63 and S63 4.4-liter V8 engine applications, including compatible M6 and X5 models.

Fitments:
2011 BMW X6 xDrive50i
2012 BMW M6 Base
2012 BMW X6 xDrive50i
2013 BMW 550i Gt Base
2013 BMW 650i Base
2013 BMW 750Li Base
2013 BMW M6 Base
2013 BMW X5 xDrive50i
2013 BMW X6 xDrive50i
2014 BMW 550i Base
2014 BMW 550i Gt Base
2014 BMW 650i Base
2014 BMW 750Li Base
2014 BMW M6 Base
2014 BMW X5 xDrive50i
2014 BMW X6 xDrive50i
2015 BMW 550i Base
2015 BMW 550i Gt Base
2015 BMW 650i Base
2015 BMW 750Li Base
2015 BMW M6 Base
2015 BMW X5 xDrive50i
2016 BMW 550i Base
2016 BMW 650i Base
2016 BMW M6 Base
2016 BMW X5 xDrive50i
2017 BMW 650i Base
2017 BMW M6 Base
2017 BMW X5 xDrive50i
2018 BMW 650i Base
2018 BMW M6 Base
2018 BMW X5 xDrive50i

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1