Moroso 73607 Moroso Chevrolet Small Block Ignition Wire Set - Ultra 40 - Sleeved - HEI - 90 Degree - BlueMoroso 73607 Moroso Chevrolet Small Block Ignition Wire Set Ultra 40 Sleeved HEI 90 Degree Blue Ultra 40 Custom Fit Wire Set, Blue Wire, Sleeved, SBC, Under Header HEI Exterior sleeving offers improved dielectric strength for added resistance to outside pulses while electrical protecting wire against heat, chafing and contaminants 8. 65mm diameter wire with 40 ohms of resistance per foot Sleeving adds extra dielectric strength Sleeving extends spark