MSD 8570 - User Manual

Important: Read these instructions before attempting the installation.
Parts Included:
1 - Pro-Billet Distributor
1 - Rotor, PN 8467
1 - Distributor Cap, Red PN 8431 or Black PN 84313
1 - Wire Retainer
2 - 1.5" Self Tapping Screws
2 - Panhead Phillips Screws
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.
TIMING FUNCTIONS
Before continuing with the installation, here are a few denitions 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.
1 - Advance Kit
1 - Gasket
1 - Tube of Gear Lubricant
2 - O-Rings
WARNING: Before installing the MSD Distributor, disconnect the battery cables. When discon-
necting the battery cables, always remove the Negative (-) cable rst and install it last.
MSD Pro-Billet Small Diameter
Chevrolet V8 Distributor
PN 8570/85703
MSD • WWW.MSDPERFORMANCE.COM • (915) 857-5200 • FAX (915) 857-3344
ONLINE PRODUCT REGISTRATION: Register your MSD product online. Registering your product
will help if there is ever a warranty issue with your product and helps the MSD R&D team create
new products that you ask for! Go to www.msdperformance.com/registration.

Summary

TIMING FUNCTIONS

Initial Timing

Base timing setting for the engine before centrifugal advance begins.

Centrifugal Advance

Mechanical advance mechanism based on weights, springs, and cams.

Total Timing

The sum of initial timing plus centrifugal advance.

CHOOSING AN ADVANCE CURVE

Tips on Selecting an Advance Curve

Guidance for setting initial and centrifugal advance for optimal performance.

CENTRIFUGAL ADVANCE CURVE

Selecting the Advance Springs

How spring stiffness affects the rate of centrifugal advance.

SELECTING THE ADVANCE STOP BUSHING

Changing the Advance Stop Bushings

Procedure to swap advance stop bushings to alter centrifugal advance.

Locking Out the Centrifugal Advance

Method to disable the centrifugal advance mechanism.

ADJUSTING THE SLIP COLLAR

CHECKING GEAR MESH

Checking the Oil Pump to Distributor Shaft Overlap

Verifying distributor shaft and oil pump shaft fit for proper operation.

INSTALLING THE DISTRIBUTOR

Service

Limited Warranty

Details terms and conditions for product warranty repair and replacement.

MSD 8570 Specifications

General

Brand	MSD
Model	8570
Category	Automobile Accessories
Language	English