Just bought an 86 rx7 N/A and tore apart the motor intending to do a rebuild but found out the dude that had it last just used tap water as coolant thus corroding the water jackets and freeze plugs on all my side housings. Rotor housings are fine. I have a killer deal on a s4 t2 motor. Do the side housings from an s4 t2 fit on my s4 N/A motor. I wanna keep this N/A. Any help would be appreciated.

 

Yes the S4 and S5 Irons are the same in the sence that you can mix and match the Iron

The Rotor Housings are different from S4 and S5, the spark plugs are in differnt locations, so you have to use 2-S4's or 2-S5's

Also TII Housing are better due to the exhuast sleeves