The MSD HEAT HEI module uses upgraded components to produce high output for both stock and MSD applications, and it adds a built-in rev limiter that's more accurate and easier to set with the engine running than typical adjustable limiters. It's a direct fit into stock HEI distributors on non-computer-controlled 4-pin housings, delivering up to 8.5 amps and advanced dwell control for improved high-rpm output — the rev limiter can even be adjusted externally without removing the cap.
Specifications:
- Distributor Type: HEI
- Voltage Required: 12
- Maximum RPM: 10,000
- Ignition Type: Performance
- C.A.R.B. EO #: D-40-43
- Warranty: Manufacturer's Limited 1 Year Warranty
- Part Number: 83647
Compliance: This module carries California Air Resources Board (CARB) Executive Order EO# D-40-43, making it legal for sale and use on Emissions Controlled Vehicles in all 50 states when installed per MSD's application guide.
FAQ
What distributors is the MSD 83647 module compatible with?
It's a direct fit for stock HEI distributors using non-computer-controlled (4-pin) housings, including both stock and MSD applications.
Is the MSD 83647 CARB legal?
Yes, it carries CARB Executive Order EO# D-40-43.
Can the rev limiter be adjusted after installation?
Yes, the built-in adjustable rev limiter can be set externally without removing the distributor cap.
What output does the 83647 module produce?
Up to 8.5 amps, with advanced dwell control for improved output at high rpm, and a maximum rated 10,000 rpm.
