MSD 8501 Installation

MSD Digital HEI Kit

PN 8501

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Parts Included:

1 - Digital HEI Module, PN 83647
1 - HEI Coil, PN 8225
1 - HEI Cap, 84111
1 - HEI Rotor, 84101
1 - HEI Coil Cover, PN 84022

1 - Low Resistance Rotor Bushing and Insulator (assembled)
1 - Tube of Heat Sink Compound
1 - Small Screw Driver
1 - Gray Tach Wire

INSTALLATION

1. Remove the cap, rotor and module
of the original distributor. Make
sure the weights of the mechanical
advance move freely and do not
bind. Also ensure that the distributor
shaft rotates smooth with no wobble
or binding.

2. Apply a liberal coat of the Heat Sink
Compound to the aluminum base
of the Module and to the rubber
insulator. Route the wiring harness
out of the housing and position the
short black wire to ground with one
of the mounting screws (Figure 1).

3. Install the rotor. If you are using an
MSD HEI Pro-Billet Distributor, PN
8365, the supplied Rotor
Adapter must be installed
(Figure 2).

DIGITAL

HEI MODULE

APPLY

HEAT SINK

COMPOUND

DISTRIBUTOR

HOUSING

SCREWS AND

STAR WASHERS

TO TACH

CONNECT SHORT

BLACK WIRE

TO GROUND

GRAY
TACH
OUTPUT

Figure 1 Installing the Module.

CAP

CONNECTOR

USE TO
PROGRAM TACH

Figure 2 Installing the Rotor Adapter on an MSD PN 8365 HEI Distributor.

M S D I G N I T I O N • WW W. MSD IG NI TIO N. CO M • ( 9 15 ) 8 57 -5 20 0 • FA X (9 15) 85 7 -3 34 4

2 INSTALLATION INSTRUCTIONS

4. Install the cap and coil assembly (Figure 4).

5. Install the spark plug wires to their respective
cap terminals, then install the MSD Dust Cover
and its three retaining screws.

6. Connect the HEI Module harness to the
Distributor Cap. See the Tachometer Wiring
section before connecting your tachometer
(Figure 5).

7. Connect a 14-gauge (minimum gauge) wire to
the "BAT" terminal of the cap to supply the 12
volts to the HEI system (Figure 5).

Figure 3 The Coil, Rotor Bushing and Insulator.

Figure 4 Installing the Coil's Wiring.

M S D   • W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 57-5200 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4