Re-engineered to be the only true performance AC/Delco style DIS coil. ""Raised Dome"" construction, section bobbin technology, highly specialized silicone magnetic steel core, optimized windings, resistance, and turns ratio result in higher energy and voltage outputs, and longer dwell. Compatible with OE computer controlled ignition systems as well as Crane or MSD capacitive discharge DIS ignition systems. Brass contact increases energy transfer and resists corrosion better than aluminum. High dielectric strength ""ACCEL Yellow"" over molded housing. Packaged as single unit: 4 cyls require 2 coils, 6 cyls require 3 coils and 8 cyls require 4 coils.