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2 Comp's Magnum rocker arms are made from 8620 chromoly steel, will not flex like a stock stamped rocker arm, and will provide more accurate rocker ratios and valve lift. While only employing a roller tip (it still uses a ball type fulcrum), these rockers are a nice upgrade for an engine that has less than 350 lb/in open spring pressure. Best of all, they will fit under most stock valve covers for a nice stealthy upgrade to your engine. Comp Cams offers several styles of steel rockers with full roller bodies as well.