MSD DIGITAL GM HEI MODULE HI-ENERGY P/N 83647 IMCA CRANE MALLORY MOROSO SCCA

Description

MSD NEW HEI MODULE P/N#83647
PN 83645 SUPERCEDED TO MSD 83647 **PART #83645 IS NO LONGER MADE.**
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
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 Module you buy-period!
Produces an incredible 7.5 amps of juice!
Adjust the rev limiter without removing the cap!
Fits in stock HEI distributors
PROGRAMMING THE REV LIMIT :
A tachometer is required to set the rev limit. The limit is programmed by running the engine at half the desired rpm, then momentarily grounding the Gray tach output wire from the MSD. A Gray jumper wire is supplied to connect to the tach with another tee-splice coming off to use for programming. A switch may also be installed to ease adjustments of the limiter (Figure 4). The default rpm limit is 10,000 rpm.
1. Start the engine and bring the rpm to half the desired rev limit (for a 6,000 rpm limit, raise the rpm to 3,000).
2. While holding the rpm steady, short the Gray tach wire to ground for approximately one second. Note that the tach will go to zero while grounded.
3. The tach will now display the programmed rev limit amount for two seconds. If this value does not register on the tach, repeat the procedure and try a different ground source.
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