Part Number: FCPPB850090M50Manufacturer: FCP EngineeringForged high performance pistons for a variety of applications in almost all engine types for racing and street use.Made from 4032-T6, molybdenum coated piston bottom.Each piston kit also includes HD series rings and fittings.Cylinder bore : 85.00mm Compression Ratio (CR): 9.0:1 Compression height: 32.50 mm Link diameter: 22 mm Stroke: 84.00 mm BMW 328 528 Turbo (M50B28, M52B28) Link length must be 135 mm These pistons are intended for the BMW 2.8 M50B25 engine with increased connecting rod stroke M52B28!