83613 MALLORY | Alldatasheet

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MSD • WWW.MSDPERFORMANCE.COM • (915) 857-5200 • FAX (915) 857-3344 Important: Read these instructions before attempting the installation. Parts Included: 1 - Pro-Billet Distributor 1 - Rotor, PN 8467 1 - Distributor Cap, Red PN 8433 or Black PN 84333 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 8361/83613 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 8361/83613 Only) 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. MSD Pro-Billet Chevrolet V8 Distributor PN 85551/85555 and PN 8589 with Vacuum Advance, PN 8361/83613 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.

2 INSTALLATION INSTRUCTIONS

MSD • WWW.MSDPERFORMANCE.COM • (915) 857-5200 • FAX (915) 857-3344 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. 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.

4 INSTALLATION INSTRUCTIONS

MSD • WWW.MSDPERFORMANCE.COM • (915) 857-5200 • FAX (915) 857-3344 Figure 6 Changing the Advance Stop Bushing. SELECTING THE ADVANCE STOP BUSH- ING Five different advance stop bushings are supplied in the distributor kit. The distributor comes with a Blue (21°) bushing already installed. If a different amount of centrifugal advance is desired, follow the next procedure to change the bushings. The chart in Figure 5 gives the size and approximate degrees for the corresponding bushings. CHANGING THE ADVANCE STOP BUSHINGS 1. Remove the distributor cap and rotor. 2. Remove the locknut and washer on the bottom of the advance assembly (Figure 6). 3. Remove the bushing and install the new one. Install the washer and locknut. LOCKING OUT THE CENTRIFUGAL ADVANCE 1. Remove the advance components including the springs, weights and the advance stop bushing from the advance assembly. 2. Remove the roll-pin from the drive gear and remove the gear from the shaft. 3. Slide the shaft two inches out of the housing. 4. Rotate the shaft 180° and insert the advance stop bushing pin into the small hole on the advance plate (Figure 7). 5. Install the locknut and washer to the advance stop bushing pin. This locks the advance in place. 6. Install the drive gear and roll-pin. Note: If you want to lock out the vacuum advance of the PN 8361/83613 Distributor, see page 6. Figure 6 Locking Out the Centrifugal Advance. Figure 7 Locking Out the Advance. Figure 5 Advance Stop Bushing Chart. BUSHING SIZE APPROXIMATE CRANKSHAFT DEGREES Red-Smallest 28 Silver 25 Green 23 Blue 21 Purple 19 Black-Largest 18

6 INSTALLATION INSTRUCTIONS

MSD • WWW.MSDPERFORMANCE.COM • (915) 857-5200 • FAX (915) 857-3344 VACUUM ADVANCE LOCKOUT If you do not want to use the vacuum advance canister of the PN 8361/83613, MSD has supplied a lockout mechanism. 1. Remove the two Allen head screws that hold the advance canister (Figure 11). 2. Remove the snap ring that holds the magnetic pickup assembly in place. 3. Gently lift up on the mag pickup plate and slide the vacuum canister out. 4. Install the Lockout Plate in place of the canister. Install the two retaining screws. 5. Install the supplied screw and washer through the Lockout and tighten. 6. It is important to make sure the pickup plate is parallel with the housing of the distributor (Figure 12). If it is cocked or slanted, the paddles of the reluctor may contact the pickup. Check the clearance by rotating the distributor shaft. If necessary, use the supplied shims under the Lockout hold-down to correctly position the pickup plate. Note: If no shims were required, use one beneath the washer of the Lock-Out Hold Down Screw. Note: Do not forget to plug the original vacuum advance hose. Figure 12 Checking Installation of the Lockout Plate. Figure 11 Removing the Vacuum Canister. RELUCTOR PADDLES CANISTER SCREWS MAG PICKUP PLATE SNAP RING

Figure 15 Wiring with an MSD 7-Series Ignition and Timing Control. Note: MSD 6 and 7 Series Ignitions share the same color wiring. Limited Warranty MSD warrants this product to be free from defects in material and workmanship under its intended normal use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of the original purchase. This warranty is void for any products purchased through auction websites. If found to be defective as mentioned above, it will be repaired or replaced at the option of MSD. Any item that is covered under this warranty will be returned free of charge using Ground shipping methods. This shall constitute the sole remedy of the purchaser and the sole liability of MSD. To the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied, including any implied warranty of merchantability or fitness. In no event shall MSD or its suppliers be liable for special or consequential damages. *Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD. Any modifications to this item or if it is used on an application other than what MSD markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work for the application they are intending. MSD will accept no liability for custom applications. Service In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty. When returning MSD components for warranty service, Proof of Purchase must be supplied for verification. After the warranty period has expired, repair service is based on a minimum and maximum fee. All returns must have a Return Material Authorization (RMA) number issued to them before being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit our website at www.msdperformance.com/rma to automatically obtain a number and shipping information. When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include a detailed account of any problems experienced, and what components and accessories are installed on the vehicle. The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered by warranty). For more information, call MSD at (915) 855-7123. MSD technicians are available from 7:00 a.m. to 5:00 p.m. Monday - Friday (mountain time). MSD • WWW.MSDPERFORMANCE.COM • (915) 857-5200 • FAX (915) 857-3344 © 2016 MSD LLC FRM 34162 Revised 08/16