At some point in the mid 1970s or so, GM (with Delco Remy) came up with a new electronic ignition system known as HEI or High Energy Ignition. We've touted this as an upgrade for many engines in ...
Davis Unified Ignition (DUI) install In An AMC 304 Four Wheeler's Verne Simons installs a ignition system known as HEI or high energy ignition by Davis Unified Ignition in an AMC 304.
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