- High-output module for 4-pin GM HEI distributors
- Externally adjustable rev limiter
- Advanced dwell control circuitry
- Up to 8.5 amp output capability
- Direct replacement for non-computer controlled HEI systems
- Improves spark consistency and high-rpm performance
- Street performance ignition upgrade
The MSD Heat HEI Module is a high-output replacement module designed for 4-pin, non-computer controlled GM HEI distributors. It enhances spark performance while maintaining compatibility with factory-style HEI housings.
Advanced dwell control technology improves coil saturation at higher engine speeds, helping maintain strong and consistent spark delivery. The integrated adjustable rev limiter adds an extra layer of engine protection and can be accessed externally for convenient tuning adjustments.
Designed for street performance applications, this module installs easily in compatible HEI distributors and provides improved ignition reliability over stock components.