For a 90' RX-7: I have a NEW Front Iron but have several small 'nicks' in the thin wall area of the inner O-ring. I haven't read anything about 'nicks' to disqualify a housing. It looks like 6 tiny nicks on the left side (looking down) at the rotor face. Sorry, no picture. I cant tell if they are casting marks or not, but I can catch them with my finger nail.

Anyone know if nicks are ok?