MSD Performance 83647 - Digital HEI Module, GM

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.

• Digitally controlled module for accurate timing
• High drive currents to the coil
• Adjustable rev limiter for over-rev protection
• Fit in a stock HEI Distributor
• Direct plug in for the 4-pin HEI Module