MSD Heat HEI Ignition Module and High Performance HEI Coil Kit

Ignition Module

This all new Heat HEI Module supersedes the current PN 83645. Using upgraded components, the 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.

Works with non-computer controlled (4-Pin) HEI housings.

• 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
• 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

MSD Tech Bulletin (PDF)

Replacement Coil

HEI owners now have a choice to replace their stock coil with the MSD High Energy Unitized Coil for GM HEI Distributors. This coil is a direct re­placement of the stock coil. The coil features special low induc­tance, high temperature windings which charge faster to give you increased spark energy at higher rpm. The premium epoxy filled construction is designed to withstand harsh race applications as well as the wear and tear that daily usage dishes out, and still deliver more spark energy to the spark plugs.

• Direct performance replacement for GM HEI coil-in-cap distributors
• 70:1 turns ratio and lower primary resistance produce high voltage output

547-83647 Instructions (PDF)