I just purchased a dead 90 model RX7.

During the attempt to crank it heard something funny around the radiator only to later see a mist in the air after I removed the radiator cap and tried to start it.

I just want to confirm that I've got a blown seal between the housings and I need to pull it out for a rebuild.

Also are the s4 and s5 short blocks interchangible as I'm thinking of grabing an s4 for $400 as a temp fix while I rebuild this one.

-thanks all
Bret

 

Yes, you have coolant o-ring failure. I have a rebuilt 13B sitting in the garage which I need to sell, if you are interested.