old chain drive 4g32
 

I have an old Mitsubishi Saturn 4 G32 with chain drive timing. I am trying to do a rebuild but the rings I ordered are not thick as I think they should be. Is 2.5mm clearance in the groove acceptable or what am I needing to do.
top groove is 2.56mm Middle groove 2.48mm and the oil ring is 2.98 mm Is that correct? Do I need thicker rings? Need some help here Thanks