Description Product Type: 1181 Electronic Ignition Conversion Kit fits for Delco 8 Cylinder 1956-1974. Part Number: The part number of the ignition conversion kit is 1181. Size: 10cmx10cmx2cm/3.94inchx3.94inchx0.79inch. Please check the product's compatible model carefully before purchasing. Function: The 1181 Ignitor delivers twice the voltage to the spark plugs, increasing horsepower, fuel economy, and spark plug life, 2:1 improvement over points in current fall time for increased coil output. Durable Construction: The use of epoxy molding makes the electronic ignition conversion kit impervious to dirt, oil, and moisture. Easy Installation: Direct replacement for old or broken 1181 ignitor, no modification required. Specification: Material: Metal, PP Size Chart: 10cmx10cmx2cm/3.94inchx3.94inchx0.79inch Package Includes: 1181 Electronic Ignition Conversion Kit Note: Please allow slight errors due to manual measurement and different monitors.