Here’s the PerTronix Flame-Thrower HEI module, which is the brains of this operation. It processes ignition coil saturation while the reluctor (not pictured) acts as a switch, like ignition ...

We analyze 10 common myths regarding HEI (High Energy Ignitions) distributor system including ones regarding internal coils, billet housings, performance gains, vacuum advance, and plug wires ...

This means the coil charges faster and transfers more of that energy to the spark plugs. The module is also specialized for racing. The ignition module is the equivalent of the system's brain.