MSD 7AL-3, Ignition Control
PN 7230
Important:
Read the instructions before attempting the installation.
Parts Included:
1 - 7AL-3, PN 7230
1 - Parts bag (wires and connectors)
4 - RPM Modules 3000, 7000, 8000, 9000
4 - Retard Modules 2°, 3°, 4°, 4°
4 - Zero Degree Modules
4 - Vibration Mounts
WarnIng
: During installation, disconnect the battery cables. When disconnecting the battery,
always remove the Negative cable first and install it last.
note:
The MSD 7AL-3 will retard the ignition timing approximately 4° compared to other MSD Ignitions.
After installation, the timing should always be checked and adjusted at idle and total timing.
note:
This unit is designed for 8-cylinder engines only.
CoIL ReCoMMeNDAtIoNS
The MSD 7AL-3 can be used with a variety of coils, but to receive the best performance, it is
recommended to use an MSD Coil. For drag racing and “short duration” applications, the Pro Power
Coil, PN 8201, is the best choice. For street applications or long duration racing events, the HVC Pro
Power Coil, PN 8251 is recommended. The 7AL-3 may be used with a GM HEI Distributor with an
internal coil, however the Rotor bushing
must
be replaced with an MSD Low Resistance bushing,
PN 8412.
MoUNtING
The 7AL-3 can be mounted under the hood, but should be mounted in a position away from direct
engine heat sources. Use the ignition as a template and mark the location of the mounting holes.
Remove the unit and drill the holes using a 1/4" bit. Install the vibration mounts to the 7AL-3 then
mount the ignition using the supplied lock washers and nuts.
WIRING
Wiring the 7AL-3 will be simple by following the instructions. There are several color coded wires
supplied with the 7AL-3 and should be used as noted to avoid confusion or wrong connections. This
section is also broken down into two sections; Primary Wiring and Optional Wiring.
• The Primary section designates the wires that must be connected to run the engine.
• The Optional Wiring section explains the wiring of optional built-in features such as the Rev Controls,
RPM Activated Switch and Retard Controls.
WarnIng
: The 7AL-3 produces very high voltages. Never short the battery or coil terminals. Use
caution during installation and while working near the ignition.
M S D I G N I T I O N
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