Looking for some info. I've been sitting on a japanese 12a turbo with 8.5:1 compression rotors. I remember reading somewhere the 12at rotors weighed the same as USDM 12a rotors and can use counterweights/flywheels interchangebly but I cannot confirm that. I haven't torn down my motor for parts/rebuild but am digging for information. Also looking for any info I can get on the 12at technically.

 

we don't have the parts catalog for anything the 12A-T came in with an A/T, but we do have the 84-85 JDM Rx7 parts catalog. the 6pi engine, did have an A/t and uses the same rotors and CW's as the US engine. the 12A-T uses the same front counterweight as the 6pi engine, so therefore the rear should also work.

 

83-85 rear cw will work.