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Look closely at these valvesprings and you'll notice something different. They are made from an ovate wire with a decreasing diameter toward the top. This spring saves weight and uses a lighter retainer (because of the smaller comparative size). The spring is also a variable weight that helps to minimize spring resonance. This shot is from a new LS7 Corvette engine destined to power an '06 Z06. Latest horsepower figures show this engine produces 505 horsepower from 427 cubic inches of aluminum. View Related Article
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