Engine Kits

MSD Heat HEI High Energy Module
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MSD Ignition

MSD Heat HEI High Energy Module

Part #: 83647
List Price: $307.90
Our Price: $153.95
You Save: $153.95

The all new MSD 83647 Heat HEI Module supersedes the current PN 83645. Using upgraded components, the 83647 HEAT produces high output for stock and MSD applications plus has a built-in rev limiter that is more accurate and easier to set with the engine running.

The main difference between the two modules is that the 83647 adds a built in rev limiter that is programmed through the green tach output wire

The Hottest HEI Module you buy-period! Produces an incredible 7.5 amps of juice! Adjust the rev limiter without removing the cap! Fits in stock HEI distributors and Aftermarket HEI Ready To Run distributors


  • Easily installs to non-computer controlled (4-Pin) HEI housings
  • Built-in adjustable rev limiter can easily be set externally
  • Advanced dwell control for improved high rpm output

User Instructions:
PDF 83647

Brand MSD Ignition
Module Pin Quantity 4
Part Type Ignition Modules
Product Line MSD Digital GM High Energy Modules with Rev Limiters
Quantity Sold individually.
Wiring Harness Included Yes