8360 Datasheet, PDF (1/8 Pages) Mallory performance club – MSD Pro-Billet Ready-to-Run Distributor

MSD Pro-Billet Ready-to-Run Distributor
Chevrolet V8, PN 8360/83603
Chevrolet 348, 409, PN 8393
Chevrolet 409 Aluminum Block Only, PN 83931
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Parts Included:
1 - Pro-Billet Distributor
1 - Rotor, PN 8467
1 - Distributor Cap, Red PN 8433 or Black PN 84333
1 - Wire Retainer
2 - 1.5" Self Tapping Screws
2 - 10-32 x 3/4" Socket Head Screws
1 - Advance Kit
1 - 3-Pin Harness
1 - Gasket
1 - Tube of Gear Lubricant
2 - O-Rings
1 - Vacuum Advance Lock-Out Kit
1 - Gray Tach Jumper
WARNING: Before installing the MSD Ready to Run Distributor, disconnect the battery cables. When
disconnecting the battery cables, always remove the Negative (-) cable first and install it last.
Note: The terminals of this Ready-to-Run Distributor require spark plug style terminals. You may need to
change the terminals and boots of your wires. MSD offers two kits, PN 8849 or PN 8848 that are supplied
with nine boots and terminals.
Note: If the gear is ever replaced, MSD Gear (PN 8531) is required for replacement due to the .500"
diameter shaft.
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 and rate of advance that your distributor is
capable of is determined by the centrifugal timing. 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 cap the
vacuum canister and plug the vacuum line.)
Vacuum Advance: The vacuum advance will advance the timing up to approximately 12° 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: MSD Distributors are supplied with the heavy (slow) advance springs and the 21° stop bushing
installed. This is to prevent detonation in certain applications. Review the information on pages 2-4
to determine the best advance curve for your application.
RPM LIMIT AND TACHOMETER INFORMATION
Tach Signal: The Ready-to-Run Distributor features a Gray Tach Output wire which provides a clean signal
for most tachometers and even some aftermarket fuel injection systems. The signal output
is a 12 volt square wave, 20° duty cycle. This wire is also responsible for programming the
built-in rev limiter.
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