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: 4B1906H Bearing size: .025 Bearing half type: Identical halves Bearing material: F781 Technical data (mm) Max overall length: 15.5 Max shaft size: 45 Max tunnel size: 48.024 Max vertical oil clearance: 0.05 Max wall at crown: 1.502 Min shaft size: 44.976 Min tunnel size: 48 Min vertical oil clearance: 0.032 Technical data (in) Max overall length: 0.610235006 Max shaft size: 1.771650016 Max tunnel size: 1.890704897 Max vertical oil clearance: 0.0019685 Max wall at crown: 0.059133741 Min shaft size: 1.770705136 Min tunnel size: 1.889760017 Min vertical oil clearance: 0.00125984 Engine code F23A1 / F23A4 / F23A5 / F23A7 / F23Z2 / F23Z4 / K20A3 Applicat