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Dart threw on relatively new Ultra Pro Magnum roller rockers from Comp Cams (1.7 ratio). Interestingly, they're steel, not aluminum-a feature selected for its strength and long-term durability. In fact, their 8650 chrome-moly steel material is, according to Comp Cams, 300 percent stronger than typical aircraft aluminum rockers. To keep the weight down, they have an open design and the black finish looks pretty cool, we think. Too bad they'll be hidden by the valve covers.