E3 DiamondFIRE Sleeved Racing Spark Plug Wire Set for Small Block Chevy (SBC)-Under Headers E3.1503This E3 DiamondFIRE Racing Spark Plug Wire Set features a unique design that is engineered to work in concert with the E3 DiamondFIRE ignition system. The features include: Small Block Chevy Under the Headers Fully Heat Sleeved 90 Degree Boot (on the plug end) Class F40 spiral conductor Rated at 40 Ohms per foot Impregnated with Ferrite, an iron alloy that improves magnetism 8. 5mm 100% silicone outer jacket encases a 100% silicone inner jacket with