83647 Datasheet, PDF (1/4 Pages) Mallory performance club – MSD HEAT Digital HEI Module

MSD HEAT Digital HEI Module
PN 83647
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This Module is a performance replacement for GM’s 4-Pin HEI Module. It features a programmable
rev limiter for overrev protection. The Module will mount in a stock HEI housing (by removing the
original condenser assembly) or in MSD’s Pro-Billet HEI Distributor, PN 8365. A GM Coil can be used
or for maximum performance, use MSD’s HEI Coil, PN 8225.
Parts Included:
1 - HEI Module, PN 83647
1 - Tube of Heat Sink Compound
1 - Gray Tach Wire
2 - Mounting Screws and Star Washers
1 - Low Resistance Rotor Bushing, PN 8412
Note: A tachometer is required to program the rev limit.
INSTALLATION
1. Mark the location of the spark plug wires on the cap prior to removal.
2. Remove the cap, rotor, module and condenser (if equipped) from the original distributor.
3. Apply a liberal coat of the Heat Sink Compound to the aluminum base of the Module.
4. Route the wiring harness out of the housing and position the short Black wire to ground with one
of the mounting screws (Figure 1).
5. Position the module in the distributor then locate the two screws and star washers to secure the
module (Figure 1).
6. Reinstall the rotor
and cap.
7. Connect the HEI
Module harness
SCREWS AND
STAR WASHERS
CONNECT SHORT
BLACK WIRE
TO GROUND
to the Distributor
Cap followed by
the 12 volt (BAT)
wire. This wire
should be at least
REV LIMIT
BYPASS
JUMPER
CAP
CONNECTOR
14-gauge (Figure
2).
DIGITAL
HEI MODULE
APPLY
HEAT SINK
COMPOUND
GRAY
TACH
OUTPUT
DISTRIBUTOR
HOUSING
TO TACH
USE TO
PROGRAM TACH
Figure 1 Installing the Module.
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