MSD 83647 Digitial HEI Modules

.High output replacement HEI module with built-in rev limiter. Using upgraded components, the HEAT HEI module 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.. CARB EO # D-40-43
.Fits in stock HEI distributors
.Adjust the rev limiter without removing the cap!
.Built-in adjustable rev limiter can easily be set externally
.Advanced dwell control for improved high rpm output
.Easily installs to non-computer controlled (4-Pin) HEI housings