ive done this conversion today no problems but the only think was the water pipes, where the orgional beehive cooler sat you have 2 water pipes on from the beehive the other from the heater matrix, i have a s2 hard pipe (the one from the rad end to heater matrix) so i fitted that and ended up blocking off the shorter of the 2 pipes, is there a better way or is that how everyone else is doing it?
will get a pic up soon

thanks
Mark

 

This is all I know about 2nd Gen Coolers in a 1st Gen:

https://www.rx7club.com/1st-gen-archive-71/cooling-oil-how-install-fc-oil-cooler-1st-gen-write-up-pics-478521/

Good luck and post up!

 

thats the thread i followed very helpfull but it doesnt say anything about the coolant lines

thanks
Mark