Hei Module Symptoms: Rough Idle, Pinging, Poor Performance, Stalling When one part of the HEI module fails, the engine has no spark and does not run.

Read the tech article on HEI Coils And Modules, brought to you by the experts at Chevy High Performance Magazine.

Think that a GM-Style HEI-Based Ignition Mopar is blasphemous? Thanks to Steve Davis and his company Performance Distributors, we show you why its not!

The HEI distributor is an inductive-discharge-style ignition, but with the points replaced by a solid-state switching device called an electronic ignition-control module.