May be the twin-turbo version from the 13B engine made to power the third-technology RX-7 released in late 1991. Each rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Perfect in good shape for a Mazda swap or alternative undertaking. https://jasperwxubc.bleepblogs.com/30284194/details-fiction-and-rx7-13b-motor-for-sale