MSD 8597 Installation

MSD Pro-Billet Chevrolet V6 Distributor

PN 8597

Important:  Read these Instructions before attempting the installation.

Parts Included:

1 - Pro-Billet Distributor
  1 - Rotor, PN 8467
  1 - Distributor Cap, PN 8014
  1 - Wire Retainer
  2 - 1.5" Self Tapping Screws
  2 - 10-32 x 3/4" Socket Head Screws

WARNING: Before installing the MSD Distributor, disconnect the battery cables. When discon-

necting the battery cables, always remove the Negative (-) cable first and install 
it last.

Note: The terminals of this 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.

1 -   Advance Kit (PN 85561, 8547 only)
1 -  Gasket
1 -  Tube of Gear Lubricant
2 -  O-Rings

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 the vacuum 
canister and plug the vacuum source).

Note: MSD Distributors are supplied with the heavy (slow) advance springs 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.

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2 INSTALLATION INSTRUCTIONS

CHOOSING AN ADVANCE CURVE

The function of the advance curve is to match the ignition timing to the burning rate of the fuel and 
speed (rpm) of the engine. Any factor that changes the burning rate of the fuel or the engine speed 
can cause a need for an ignition timing change. Figure 1 shows some of the factors that will affect 
engine timing.

FACTOR Advance Timing Retard Timing
For For

Cylinder Pressure  Low  High
Vacuum  High  Low
Energy of Ignition  Low  High
Fuel Octane  High  Low
Mixture (Air/Fuel)  Rich  Lean
Temperature  Cool  Hot
Combustion Chamber Shape  Open  Compact
Spark Plug Location  Offset  Center
Combustion Turbulence  Low  High
Load  Light  Heavy

       Figure 1 Ignition Timing Factors. 

As you can see from the chart, most factors will change throughout the range of the engine operation. 
The timing mechanism of the distributor must make timing changes based on these factors.

Example: An engine has 11:1 compression with a high energy ignition. With the specifications given, 
you will have to retard the timing for the high compression and high energy ignition. By comparing 
the engine’s specifications against the chart, a usable timing guideline can be found. Engines with a 
combination of items from both columns will require a timing that is set in the mid range.

Obviously a full technical explanation of correct ignition timing would be very complicated. The best 
way to arrive at a suitable ignition curve for your engine is to use the Ignition Timing Factors Chart 
as a guide and compare it to the Advance Graphs in Figure 4 until a suitable curve is found. When 
selecting your advance curve, use detonation (engine ping) as an indicator of too much advance, 
and a decrease in power as an indicator of too little advance.

TIPS ON SELECTING AN ADVANCE CURVE

•  Use as much initial advance as possible without encountering excessive starter load.

•  Start the centrifugal advance just above the idle rpm.

•  The  starting  point  of  the  centrifugal  advance  curve is  controlled  by  the  installed  length  and 
  tension of the spring.

•  How quickly the centrifugal advance (slope) comes in is controlled by the spring stiffness. The 
  stiffer the spring, the slower the advance curve.

•  The  amount  of  advance is  controlled by  the  advance bushing. The  bigger  the  bushing,  the 
  smaller the amount of advance.

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INSTALLATION INSTRUCTIONS 3

CENTRIFUGAL ADVANCE CURVE

SELECTING THE ADVANCE
SPRINGS

The rate, or how quick the advance comes in 
is determined by the type of springs which are 
installed on the distributor. The MSD distributors 
are  equipped  with  two  Heavy  Silver  springs 
installed.  These  will  give  you  the  slowest
advance curve  possible  (Figure  2).  The parts 
kit contains two additional sets of springs which 
can  be used  to  match the  advance  curve  to 
your particular application. Refer to the Spring 
Combination Chart (Figure 3) for combinations 
that can be achieved.

To  change the  springs, remove  the  cap  and 
rotor and use needlenose pliers to remove the 
springs.  Be  sure  the  new  springs  seat  in  the

groove on the pin.

Timing Curve From Factory

Figure 2 The Factory Equipped Curve. 

SPRING COMBINATION RATE OF ADVANCE FIGURE 4

2- Heavy Silver  SLOWEST  A
1- Heavy Silver    B
1- Light Blue   
1-Heavy Silver    C
1-Light Silver   
2- Light Blue    D
1- Light Silver    E
1- Light Blue   
2- Light Silver  FASTEST  F

Figure 3  Spring Combination Chart. 

Figure 4 Advance Curves.

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