I've read a lot on the JE HNS & Sealed Power Hell Fire rings but it seems like most of the guys are talking about them in aluminum blocks. From my understanding the top ring is actually stronger than the cylinder walls and cause the walls to wear before the rings. Does anybody have any experience with them in a cast iron block and can give any feedback?

I'm running a set of the JE HNS rings (hybrid of the Hell Fire but the top ring is virtually the same) and am wondering how long they'll last before they really start to wear the cylinder walls.