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Before we introduced our revolutionary Pro Magnum Rocker Arms there were only two alternatives in competition rocker arms: stainless steel for strength and reliability or aluminum for light weight and low cost. With the Pro Magnum Rockers you get the best of both worlds. ? Made from 8650 chromemoly steel which is 3 times stronger than aluminum ? Lifetime warranty on the bodies because they are so strong ? Fully rebuildable ? Reduced mass in low stress areas to reduce weight for more RPMs and better valve train stability ? Larger trunion with more needle bearings to spread the load more evenly ? Design allows for plenty of clearance for larger diameter valve springs

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