Description 4age 16 Smallport OEM Pistons 81.5mm Size: 81.5mm Set of 4 pistons Compression: 10.3:1 Gudgen Pins Ring Set (NPR or TP Rings depending on stock – Both are equal quality & made in Japan) Locks These pistons require the block to be bored out to suit. They will run on the stock ecu system and the compression is the same as the OEM size piston.
