MSD 8401MSD HEI Modified Cap Coil Adaptor Cover Chevy SBC

Want the power of an external coil but don't want to replace your whole HEI distributor? Now you can run any external coil you want with your HEI distributor! These modified HEI dust covers allow you to remove the stock HEI coil in your distributor cap and replace it with an externally mounted coil. By going with an external coil, you increase the resistance to overheating, improve reliability, and increase performance over the stock HEI system. You could use the MSD Blaster Coil or High Vibration Blaster Coil for increased performance, starting ability, and fuel economy!