Missing heat shields are the number one reason for burnt spark plugs and wires. Protect your Corvette with these 1965-1966 Spark Plug Barrel Shields! These shields are designed to protect your spark plugs 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.