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This was also our first chance to try out COMP's new Ultra Pro Magnum rockers (PN 1620-16). We stuck with the same 1.7 ratio, but everything else about these new rockers are better than the stamped steel pieces included in the engine kit. Even though they are 8650 chrome-moly steel, they are still 5 percent lighter where it counts at the valve, compared to aluminum rockers. This is due to their web-like structure that adds strength where needed and reduces mass in low-stress areas.