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

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.

Note: A replacement Black cap is available as PN 84333.

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.)

Vacuum Advance (PN 8361 Only): The vacuum advance will advance the timing up to 10° during

partial throttle driving (with 15 inHg 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 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

1 - Vacuum Advance Lock-Out Kit

(PN 8361 Only)

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.

MSD Pro-Billet Chevrolet V8 Distributor

PN 85551and PN 8589

with Vacuum Advance, PN 8361

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.