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Missing heat shields are the number one reason for burnt spark plug wires. Protect your Corvette with these 1957-1979 Spark Plug Boot Heat Shields! These shields are designed to protect your stock or aftermarket spark plug wires from excessive exhaust manifold heat. Often times, these shields can be removed during routine engine tune-ups to gain access to ignition components and are commonly missing entirely from a restoration. These direct replacement shields are designed for long lasting good looks and functionality.