Re using cast iron rings?

Cheap as rings are, I wouldn't, but go for it. Sounds like you're sold.
I USED CAST RINGS BUT NEVER AGAIN THAT WAS OK& WORKED BUT IT USED OIL ALL THE TIME I BUILT MY LST MOTOR & PUT IN MOLLY STEEL RINGDS I LOVE TEM THEY R NOT THAT HIGH SEAT FAST & R GREAT RINGS NO OIL USEAGE I GOT20 K ON THE MOTOR