The darker one?I have 12 sets all are f cast like the one in the bottom pic.View attachment 82178
I have not.That black coloring looks similar to what you'd see after heat treating steel to me. Weird that they have the same part number though. Did you try to clean the black coloring off to see if the Caber marking is there?
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If I got it right F-Cast are harder rings, they reportedly break in slower, don't seat as fast due to their higher hardness/stiffness.Is "f cast" a process? A different material? Is this for longer life, better seal or easier break-in? What's the big selling point?
Yeah, I was thinking the same thing....The problem people see if the rings don't wear as quick the cylinder may.Would rather change rings than cylinder...
Cheers,Chris