Oversize piston sets specially designed for the 3A bubble block used in Audi 80 models. For use with VW's 92.8mm crankshaft and 144mm rods, these pistons can also be used when boring and stroking a 1.8L engine. Stock 10.5:1 compression ratio best suited for normally aspirated engines and nitrous motors. Lower 9:1 compression ratio ideal for forced induction (turbocharging or supercharging) applications. These are the same 8V pistons used in our SportTuned 2.0L Engine Kits for 1.8L engines.Prices include pistons, rings, wrist pins and clips.Note: Oversize pistons require boring the cylinder block.