'70 Chevelle Front Rotors

[Ls6 Ragtop]

Damien,
If your car has it's original front backing plates they will tell which style rotor was on the car.
If the car has # 5463496 & 5463497 it had 2 piece rotors.
If the numbers stamped on the backing plates are 5463565 & 5463566 then it had 1 piece rotors.
All this info is useless if the plates are not original to the car.
The other way to know which style the car came with can be found on the build sheet of the car if you have one.
From memory I believe codes AS and DK are 2 piece codes and DT is 1 piece. I am traveling right now and can't reference my build sheet collection right now.
I would lean towards 2 piece rotors if your cowl tag date is 12 B but it could go either way in my opinion if it's 02 B.
I have seen cars built into March of 70 with 2 piece rotors.
My February built LS6 convert from the Baltimore plant has 2 piece rotors.
Hope this helps.
Chris