The rings in me Merc 25 (86 version with the Nikasil block) are rectangular shaped rings, not the beveled kind; and they are steel, not cast iron (I can bend them in a knot without breaking them). The outer surface, that wears on the wall, appears to NOT be chromed for it developed rust spots overnight.

Since these rings cost an outrageous 62 bucks a set, and they are the same size as 22 cube crossflow rings (that are cast iron), could I run those rings instead? Wouldn't want to hurt the cylinder wall, that's the concern I have.

Thanks,

Jeff