JE Pistons Brian Crower H Beam Rods Integra GSR B18 B18C B18C1 11.5:1 81.5mm Fitment: 94-01/Acura Honda/Integra Gsr/302504: B16A1 B16A2 B16A3 B18A B18B B18C1 B18C5 / BC6026: B18c::Compression ratio will vary depending on your engine application and head gasket thickness.