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: 8B663HD Bearing size: STD Bearing half type: Lower Bearing material: F781 Technical data (mm) Max overall length: 21.25 Max shaft size: 53.34 Max tunnel size: 56.52 Max vertical oil clearance: 0.077 Max wall at crown: 1.575 Min shaft size: 53.315 Min tunnel size: 56.507 Min vertical oil clearance: 0.023 Technical data (in) Max overall length: 0.836612508 Max shaft size: 2.099995819 Max tunnel size: 2.22519242 Max vertical oil clearance: 0.00303149 Max wall at crown: 0.062007751 Min shaft size: 2.099011569 Min tunnel size: 2.22468061 Min vertical oil clearance: 0.00090551 Engine code 262 V8 / 265ci L99 / 267 / 4.8L Gen III LR4 / 4.8L Gen IV LY2 / 302