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This engine was built with titanium intake and exhaust valves. These are ultralightweight for high revving, and they require a little less spring pressure than a heavier stainless steel valve, however, they aren't meant for prolonged street use. Valvespring and cam profile technology has evolved so much that the 7,000 rpm that this engine spins to isn't a problem with heavier valves that will wear better on the street. View Related Article
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