Could be the twin-turbo Edition of the 13B engine meant to electrical power the third-technology RX-7 launched in late 1991. Each individual rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Excellent in good shape for your Mazda swap or substitute https://marioyqfwm.answerblogs.com/39278791/the-best-side-of-built-13b-motor-for-sale