Holley EFI 556-163 Smart Ignition Coil Set of 8

Direct bolt-on to factory valve covers Same wiring pinout as other IGN-1A coils for easy plugin upgrades (Will not work with factory wiring) 172 mj of spark energy, more than any other smart coil on the market for maximum fuel burn during combustion Low current draw means less demand on the electrical and charging system Built-in ignitor for compatibility with Holley EFI and many other aftermarket ECU’s Maximum operating voltage of 18 volts – for compatibility with both 12 volt and 16 volt electrical systems found in many performance/race applications