The Supertech forged piston set for Ford/Mazda 2.3L engines with an 89mm bore comprises four pistons with a -7cc dome producing an 11:1 compression ratio. Sold as a set of four excluding rings, these pistons are meant for engine rebuilds where the stated bore and combustion chamber volume are required to achieve that compression.
Supertech Ford/Mazda 2.3L 89mm Bore -7cc Dome 11:1 CR Pistons - Set of 4 (Excl Rings)