Pertronix D134620 Flame-Thrower Black Cap Vacuum Advance Electronic Distributor with Ignitor Technology for Ford 351C All new lightweight cast aluminum housings modeled after the original distributors Tailored advance curve for optimal performance and drivability Integrated Ignitor electronic ignition delivers twice the voltage to the spark plugs, increasing horsepower, fuel economy, and spark plug life Rotating cobalt magnets trigger a Hall Effect integrated circuit which enables precise timing High dielectric strength cap with brass terminals