Rotorhead34

Anyone know the identifying markings on the 9lb rotors? I have recently recieved a streetported turbo motor for my 85. I'm just not sure if it has the rotors it's supposed to have. What should I look for? The ports are large enough I can see a pretty good amount of the rotor at various times. Someone told me the s4 turbo rotors have a cast compression chamber.

www.cardomain.com/id/rotorhead37