Could be the twin-turbo Edition in the 13B engine built to power the third-technology RX-seven launched in late 1991. Every rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Excellent in shape for just a Mazda swap or alternative project. https://lanemfzpe.blogdon.net/indicators-on-13b-engine-for-sale-japan-you-should-know-45959862