All V8. An AC Delco Professional, premium Ignition Control Module is the high quality product GM used 50 years ago. It increases voltage in order for the spark plugs to ignite the air/fuel mixture as the starting and charging system starts the engine, maintains the battery’s charge, and provides power to the electrical accessories while the engine is running. An AC Delco Professional Ignition Control Module features electronically welded lead connections to help reduce heat stress, failure, or cold joints. This ignition control module has been laser trimmed to provide precise values and reduce deterioration and damage. It includes a copper slug heat sink to help dissipate heat and create a more stable environment and also features a large bus bar for added support and conductivity to address the installation and operating forces that stress terminal tabs.