Ignition System - HEI (CARBURETED Models): Description
The Delco-Remy High Energy Ignition (HEI) system consists of ignition coil, spark plugs, distributor assembly and primary and secondary wiring.
The distributor housing contains an electronic control module, pick-up coil, pole piece, timer core, rotor, capacitor for radio noise suppression and timing advance mechanisms. Most applications house the ignition coil assembly within the distributor cap. See Fig 1. Full battery voltage is present at the battery terminal of distributor cap in either "START" or "RUN" position. Ballast resistance is not used in the primary system.