SKU: ALL 81208
UPC: 848238041194
MPN: ALL81208
The GM HEI Module (part ALL81208) is a replacement ignition control module for GM High Energy Ignition distributors found across small-block and big-block Chevy engines from the mid-1970s onward. It mounts inside the distributor housing and switches the coil's primary circuit, controlling spark timing and dwell. Builders running a points-to-electronic conversion or replacing a failed factory unit reach for this module because it drops into the stock distributor location without modification. We stock it for restoration projects, daily drivers, and weekend racers who want dependable spark from a proven ignition platform.
This module is the four-pin style that bolts to the distributor baseplate and connects to the magnetic pickup and coil. A failing module is one of the most common causes of an HEI distributor that cranks but won't fire, or an engine that quits when it gets hot and restarts once it cools. Replacing the module is a straightforward fix that restores clean triggering and consistent dwell. We carry the matching GM HEI coil and distributor rotor so you can refresh the entire ignition trigger circuit in one pass. Apply the dielectric heat-sink grease between the module and the baseplate during install to keep the unit running cool and extend its service life.
Keep one on the shelf if you run an older GM distributor as your daily or track ignition. Heat soak kills these modules over time, and a spare in the toolbox saves a tow when an engine dies at the strip on a hot day. This module pairs naturally with a complete ignition refresh, so look at our distributor caps and full ignitions and electrical selection when you order. Whether you're finishing a restoration or sorting out a no-start, this is the part that gets a GM High Energy Ignition system back to firing on every cylinder.
It's a replacement control module for GM High Energy Ignition distributors used on many small-block and big-block Chevy engines from the mid-1970s and later. It mounts inside the distributor on the baseplate. Confirm your distributor uses the four-pin module style before ordering.
Common symptoms include an engine that cranks but won't start, stalling once the engine reaches operating temperature, or intermittent misfires. A classic sign is a no-start when hot that clears up after the unit cools. Swapping the module is one of the first checks on these distributors.
Yes. Apply a thin layer of dielectric heat-sink compound between the module and the distributor baseplate. This grease transfers heat away from the module, which runs hot during operation. Skipping it is a leading cause of early module failure.
If your distributor has high mileage or you're chasing an ignition fault, refreshing the coil and rotor alongside the module is good practice. We stock the matching GM HEI coil and rotor so you can service the whole trigger circuit at once and rule out worn parts.
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