So I ordered a set of the Speedmaster DNA Rockers for my 408 stroker on Black Friday. I was a bit hesitant because all of the photos showed them as containing roller bearings instead of bushings, so wasn't I happily surprised when they arrived and they are bronze bushed. They look really good and came with a ton of spacers of all sizes. The shafts look really good also. It will be a while until I actually have them in a running engine, but will let you know when they are running.