how to tell what year motor is
 

i recently bought my 4th rx7, i decided to buy the car because it came with 2 motor. i recently blew the motor on my other rx7 so i got it. i was told one of the motors was a 93 and the other one a 91. the one that was said was a 93 has a singel turbo not the tt. i just wanted to ask if thers a way to tell what year the motors really are.

i would also like to ask, the car was set up with the v mount radiator. so i want some opinions, is it better having the radiator set up as a v mount or the stock way?

its an 87 gxl if it matters,

thanks in advance

Abner

bump anyone know?