Pertronix D174218 Ignitor II Distributor with Vacuum Cast for British A+ 4 Cylinder Engine All new lightweight cast aluminum housing. Tailored advance curve for optimal performance and drivability. Integrated Ignitor or Ignitor II electronic ignition module delivers more voltage to the spark plugs, increasing horsepower, fuel economy, and spark plug life. High dielectric strength cap with brass terminals. Top or side exit caps available for most engines.