Super Conductor 8.5Mm Spark Plug Wire Set Small Block Chevy With Hei Cap The Race Tailored 8.5Mm Super Conductor Wire Sets Are Designed Specifically To Fit Race Engines Equipped With Headers Or An Distributor MSD IgnitionThis combination is encased in a heavy duty sleeve that will withstand abrasion and high temperatures. Cap off each end with our Dual Crimp Terminals and you have the best wire available. Less resistance means more energy is going to make it to the spark plug to ignite the air fuel mixture. The Super Conductor uses a copper alloy conductor resulting in less than 50 ohms per foot of wire! This ensures that the most energy possible makes it to the spark