At Mazdaspeed day, SpeedSource assembles a 500hp 20B tri-rotor Wankel motor. By Streetfire Tags : 20b , 370z , assembly , block , build , drift , engine , gtr , ken , mazda , mazdaspeed , miata , millen , race , rhys , rotary , rotor , rx7 , rx8 , speedsource , viper , wankel , zr1