I have not used them yet, but I bought a set of the Speedmaster 1.5 stainless roller tip rocker arms on their 40% sale a couple years ago. I measured them for a correction kit from B3 Racing and compared them to a set of Comp Ultr Pro Magnum stainless roller tips I also had here. Every way I measured the two are basically identical to my measuring capabilities, so they would require the exact same correction on the same set of heads. Only difference is the materials used.