Owners manual

MSD • WWW.MSDPERFORMANCE.COM • [phone] • FAX [phone]
Mallory Unlite
®
Breakerless Electronic
Conversion Kit
For Delco 8-Cylinder Distributors
PN 501
Parts Included:
1 – Unilite Module
1 – Rotor/Shutter Wheel Assembly, PN 338
1 –Distributor Wire Harness
1 – Female Connector
1 – Ground Wire
1 – Lower Mounting Plate
1 – Silicone Grease
1 - Grommet
Retaining Screws
Note: It is recommended to remove the distributor from
the engine to install the Unilite Conversion Kit.
However, if it is easily accessible, the kit may be
installed without removing the distributor.
IMPORTANT: Before starting the installation of the
Unilite Conversion, make sure that the vehicle
wiring is equipped with an ignition ballast
resistor or loom resistance wire between the
ignition switch and the coil positive (+) terminal.
Reviewing the wiring schematic from the
vehicle’s Service Manual is the best way to
conrm however if it is not available you can
check with a volt meter.
Checking for an Ignition Ballast Resistor: With the
engine running at an idle, compare the voltage at the coil
+ terminal with that of the battery itself. If the coil voltage
is within 1-volt of the battery’s, then a ballast resistor is
required before installing the Unilte Conversion Kit. MSD
offers a resistor that can be installed inline on the coil +
wiring terminal. Failure to install the ballast resistor will
result in failure of the Unilite module.
INSTALLATION
1. Note the location of the number one spark plug
wire on the distributor cap. Mark the cap and the
distributor to indicate the number one terminal
location.
2. Mark each plug wire before removal, and remove
the distributor cap.
3. Rotate the engine in the direction of rotation until
the rotor is aligned and pointing to the number one
cylinder location. Note the timing indicator and
balancer which should correspond at Top Dead
Center (TDC).
4. If you are removing the distributor, disconnect the vacuum hose and coil wiring. Loosen and remove the
distributor clamp, then lift the distributor out of the engine. Note that the rotor will turn as you lift the distributor
out due to the helically cut distributor gear.
5. Remove the rotor, coil wiring and grommet along with the breaker points and condenser.
6. Install the Unilite mounting plate in place of the original breaker points. In some applications the circuit breaker
ground wire may interfere. If that’s the case, remove the ground wire and install the supplied ground wire
between the condenser mounting screw and the vacuum advance mounting screw.
Figure 1 Unilite Conversion Installation.
SHUTTER WHEEL
(OPTIC
INTERRUPTER)
ROTOR
6-32 SCREWS (2)
MOUNTING PLATE
NOTE 2
COUNTERBURK
HOLES
UNILITE MODULE
GREEN
RED
GROMMET
FEMALE CONNECTOR
5-32 FLAT HEAD
SCREWS (2)
8-32 SCREWS (2)
8-32 HEX NUTS
(2)