This 8-piece piston and ring set is designed for the N63B44 4.4L V8 twin-turbo engine with an 11:1 compression ratio.The set includes 8 pistons with rings, matching a cylinder bore diameter of Φ89mm.Key dimensions include a compression height of 32.1mm, overall length of 52.6mm, pin diameter of Φ22mm, and pin length of 60mm.This kit is compatible with applications requiring part numbers 11257613626, 11257576475, 11257556955, 11257574822, 11257574823, 11257617547, 8983550720, 1275100944, 0281006991, 40631600, WG1726229, NE 8907510000, and WG1889132.Intended for use in engine rebuilds on specified vehicle models.