PN8528 Datasheet, PDF (1/8 Pages) Mallory performance club – MSD Pro-Billet Ready-to-Run Distributors

MSD Pro-Billet Ready-to-Run Distributors
Pontiac, PN 8528
Oldsmobile, PN 8529
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Parts Included:
1 - Pro-Billet Distributor
1 - Rotor, PN 8467
1 - Distributor Cap, PN 8433
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
1 - Vacuum Lockout
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.
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 and an advance stop bushing. The amount of advance is controlled by the stop bushing while
the springs determine the rate of advance. 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 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. This line should be disconnected and plugged when setting the timing.
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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