MSD GM High Energy HEI Module AN to AN O-Ring Fittings One of the most common

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MSD GM High Energy HEI Module AN to AN O-Ring Fittings One of the most commonThis 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. Features: 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