PN8365 Datasheet, PDF (1/8 Pages) Mallory performance club – MSD Pro-Billet Chevrolet HEI Distributor

MSD Pro-Billet Chevrolet HEI Distributor
PN 8365
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Important:  Read these instructions before attempting the installation.
Parts Included:
1 - Pro-Billet Distributor, PN 8365
1 - Rotor, PN 84101
1 - Distributor Cap, PN 84111
1 - Coil Cover, PN 84022
1 - Digital HEAT Module, PN 83647
1 - Coil, PN 8225
1 - Advance Kit
1 - Gasket
1 - Tube of Gear Lubricant
1 - Vacuum Advance Lock-Out
2 - O-rings
1 - HEI Connector
2 - HEI Wiring Terminals
1 - HEI/Tach Connector
1 - Vacuum Advance Adjusting Kit
1 - Gray Tach Wire
WARNING: Before installing the MSD Distributor, disconnect the battery cables. When disconnect-
ing the battery cables, always remove the Negative (-) cable first and install it last.
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 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.
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.
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
the vacuum canister and plug the vacuum source.)
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.
RPM LIMIT AND TACHOMETER INFORMATION
Tach Signal: The Pro-Billet HEI 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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