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: 4B1510HX Bearing size: STD Bearing half type: Upper & lower Bearing material: F781 Technical data (mm) Max overall length: 19.55 Max shaft size: 49.992 Max tunnel size: 53.619 Max vertical oil clearance: 0.069 Max wall at crown: 1.78 Min shaft size: 49.975 Min tunnel size: 53.6 Min vertical oil clearance: 0.014 Technical data (in) Max overall length: 0.7697 Max shaft size: 1.9682 Max tunnel size: 2.111 Max vertical oil clearance: 0.0027 Max wall at crown: 0.0701 Min shaft size: 1.9675 Min tunnel size: 2.1102 Min vertical oil clearance: 0.0006 Engine code B48 A20 / B48 B20 Application BMW B48 A20 1998cc Inline4 DOHC 4v Turbo BMW B48 B20 1998cc Inline