MSD 8225 GM HEI Distributor Coil Installation - Manual

Parts Included:
1 - MSD Coil, PN 8225
1 - 4" Black Ground Wire
1 - Rubber Isolator
The MSD HEI Coil is designed for use with the MSD High Output HEI Module, PN 8364. It will work
with stock ignition modules but for maximum output use the MSD HEI Module.
Note: The Rotor Bushing supplied is a replacement unit designed for stock or mild HEI Distributors
and has very high resistance. If an MSD 7 Series or Digital Series Ignition is used an MSD Low
Resistance Rotor Bushing, PN 8412, must be used to prevent damage to the cap and rotor.
Figure 1 Installing the MSD GM HEI Coil.
1 - Rotor Bushing
4 - Mounting Screws
Disassembly
1. Remove the dust cover to access the HEI Coil and
disconnect the three wiring harnesses from the
distributor cap.
2. Remove the four screws that hold the original coil.
3. Lift the coil out of the cap and discard the original
rubber isolator and rotor bushing.
Installation
1. Install the new rotor bushing and rubber isolator.
2. Install the MSD Coil. The terminals should slide
easily into position into the cap. The Yellow and
Red leads go in the outer slots of the cap. They
cannot be interchanged.
3. Insert the Black ground wire in the center slot of
the cap and connect it to one of the Coil’s retaining
screws (Figure 2).
4. Install the other three retaining screws followed by
the dust cover and connect the harnesses.
MSD also offers the following parts to upgrade and
maintain your GM HEI Distributor:
PN 8411 Heavy Duty Cap, Red
PN 8410 Rotor
PN 8402 Factory Style Dust Cover
PN 8412 Low Resistance Rotor Bushing
PN 83645 High Output Ignition Module
PN 8401 Modified Dust Cover for External Coil
MSD GM HEI Coil
PN 8225
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