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Naturally, we replaced all of the valves. Rather than put in another set of titanium valves, we opted for a set of stainless steel valves. These are made for severe street use and should deliver years of trouble-free service. Even though these valves are quite a bit heavier, we believe that the upgrades we've made to the rest of the valvetrain will still allow us to rev the engine to its 7,000-rpm redline.