ACL bearings are used for tuning and engine upgrades where you want better quality with higher bearing capacity than normal standard bearings. Improvements of material, dynamic thickness, heat conduction, oil grooves and oil distribution are some of the points that make ACL one of the leading bearing manufacturers. Bearing data Part number: 7M1397HX Bearing size: STD Bearing half type: Upper & lower Bearing material: F780 Technical data (mm) Max overall length: 19.85 Max shaft size: 64.98 Max tunnel size: 70.019 Max vertical oil clearance: 0.114 Max wall at crown: 2.495 Min shaft size: 64.961 Min tunnel size: 70 Min vertical oil clearance: 0.06 Technical data (in) Max overall length: 0.7815 Max shaft size: 2.5583 Max tunnel size: 2.7566 Max vertical oil clearance: 0.0045 Max wall at crown: 0.0982 Min shaft size: 2.5575 Min tunnel size: 2.7559 Min vertical oil clearance: 0.0024 Engine code N54B30 / N55B30 / S55B30 Application BMW N54B30 2979cc Inline6 DOHC 4v Twin Turbo BMW N55B30 2979c