May be the twin-turbo Edition from the 13B engine designed to ability the third-technology RX-7 released in late 1991. Every single rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the overall displacement was 1308cc. Excellent fit for your Mazda swap or substitute challenge. I procured https://mazda-rx-7-engine03579.amoblog.com/top-rotary-engine-for-sale-secrets-60687093