8 Pcs Pistons & Rings 11257537124 Fit For E53 E60 E63 E64 E66 4.8L STD 21mm Engines & Components Pistons Automobiles Parts Forged steel construction provides durability and consistent performance.These pistons are manufactured to STD 0.00 specifications with a cylinder bore of Φ93.00mm and wrist pin diameter of Φ21mm, designed for fitment in 4.8L naturally aspirated engines.The set includes eight pistons and corresponding rings, engineered for and efficient power delivery. The piston ring configuration features first ring thickness of 1.2mm, second ring at 1.5mm, and oil ring at 2.4mm, contributing to effective sealing and reduced wear.Rings are designed to endure elevated engine temperatures, with material specifications supporting stability under operating conditions up to 105℃.This set is compatible with E53, E60, E63, E64, and E66 models equipped with 4.8L engines, allowing direct replacement without modifications. ote: This is a third-party compatible part.Brand/model citations do not imply sponsorship or approval.