Part Number: FCPPOC865085 Manufacturer: FCP Engineering Forged high performance pistons for a variety of applications in almost all types of racing and street engines. Made of 4032-T6, molybdenum coated piston bottom. Each piston kit also includes HD Series rings and pins. Cylinder bore: 86 .50 mm Compression Ratio (CR): 8.5:1 Height compression: 30.50 mmPin diameter: 21 mmStroke: 86.00 mmOpel / Vauxhall - 2.0 16V Turbo (C20LET, C20XE)Connecting rod length must be 143.1 mm or 148 mm (block 2.2)