Pertronix D176609 Flame-Thrower Plug and Play Vacuum Advance Side Cap Cast Electronic Distributor with Ignitor Technology for British 4 Cylinder Engine All new lightweight cast aluminum housings 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