compatibility parts for 80 and 84 rx7
 

Are the engine parts for a 1980 and a 1984 rx7 compatible?

Parts will interchange from 12a to 12a, pretty simple. In 85 there was a 13b four port offered in the GSL-SE. As long as you still have the 12a & the 84 you want to pull parts from also has a 12a then you are good.