I have 2 13b n/a engines for sale. On is rebuilt with about 30-40k miles on it and runs great asking $1500. It is out of a 1991 mazda rx7 convertible. The other is out of a 1988 rx7 convertible. It has 125k miles on it and still runs strong, asking $800 obo. If you need the ecu that will cost $75 extra. I also have 2 stock radiators make a reasonable offer and its yours. The engine that is coming out of the 1991 rx conv. is being parted out tell me what you need and i'll see if I can help you.