PN8477 Datasheet, PDF (1/8 Pages) Mallory performance club – MSD Pro-Billet Small Diameter Street Ford V8 Distributor

MSD Pro-Billet Small Diameter
Street Ford V8 Distributor
351C-460: PN 8477, PN 84771 steel gear,
351W: PN 8478, PN 84781 steel gear,
289/302: PN 8479, PN 84791 steel gear
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Important:  Read these instructions before attempting the installation.
Parts Included:
1 - Pro-Billet Distributor
1 - Rotor, PN 8467
1 - Distributor Cap, PN 8431
1 - Advance Kit
1 - O-ring Seal
1 - Tube of Gear Lubricant
1 - Parts Bag
Note: An MSD 6, 7, 8 or 10 Series Ignition Control must be used.
Note: The spark plug wire terminals of the Small Diameter Distributors are HEI style terminals. You
may need to change the terminals and boots of your wires. MSD offers a kit, PN 8850, that
comes with nine boots and terminals.
TIMING FUNCTIONS
Before continuing with the installation, here are a few definitions you should be aware of:
Initial Timing: This is the base timing (also referred to as idle timing) of the engine before the
centrifugal advance begins.
Centrifugal Advance: The centrifugal (or mechanical) advance mechanism is made up of weights,
springs, advance cams, and an advance stop bushing. The amount of centrifugal advance that your
distributor is capable of is determined by the stop bushing. If you ever wish to lock out the centrifugal
advance, refer to the centrifugal advance section.
Total Timing: This is the total of the initial timing plus the centrifugal advance added together.
Example: 10° Initial + 25° centrifugal = 35° Total Timing. (When checking Total timing, disconnect
and plug the vacuum advance.)
Vacuum Advance: The vacuum advance will advance the timing up to 10° during partial throttle
driving (with 15 lbs. of vacuum). The vacuum line should be routed to a ported vacuum outlet above
the throttle plates.
Note: Vacuum Advance can be locked using lock plate in parts bag.
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