Msd 8474 HEI Distributor Kit Installation- User Manual
Msd 8474 HEI Distributor Kit Installation– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 2 – CHOOSING AN ADVANCE CURVE; FACTOR; Figure 1 Ignition Timing Factors.; TIPs on selecTIng an advance curve
- Page 3 – CENTRIFUGAL ADVANCE CURVE; selecTIng The advance; Figure 2 The Factory Equipped Curve.; Timing Curve From Factory; SPRING COMBINATION; SLOWEST; Figure 3 Spring Combination Chart.
- Page 4 – Figure 6 Changing the Advance Stop Bushing.; Note: If you want to lock out the vacuum advance,; Figure 6 Locking Out the Centrifugal Advance.; BUSHING SIZE; Silver
- Page 5 – only be; Figure 8 Marking the Rotor Location.; INSTALLING THE DISTRIBUTOR; Figure 9 Modified Block for use with O-Rings.
- Page 6 – Figure 10 Wiring the Ready-to-Run Chevrolet Distributor.; Red
- Page 7 – vacuuM advance lockouT; Note: If no shims were required, use one beneath the; Figure 13 Checking Installation of the Lockout Plate.
- Page 8 – Figure 14 Optional Installation by Bolting the Cap Down.; limited Warranty; for special or consequential damages.; service; When returning MSD components for warranty service,; Proof of Purchase must be supplied for verification. After; All returns must have a Return Material Authorization (RMA) number; issued to them before; M S D I G N I T I O N
M S D I G N I T I O N
• w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
MSD Pro-Billet Ready-to-Run
Chevrolet V8 Distributor Kit
PN 8474
Important:
Read these instructions before attempting the installation.
P a r t s I n c l u d e d :
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
1 - Advance Kit
Note: The terminals of this Distributor Cap 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 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: 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.
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 - 3-Pin Harness
1 - Gasket
1 - Tube of Gear Lubricant
2 - O-Rings
1 - Vacuum Advance Lockout Kit
1 - Coil Wire
1 - Blaster SS Coil, PN 8207
WARNING: Before installing the MSD Ready to Run Distributor, disconnect the battery cables.
When disconnecting the battery cables, always remove the Negative (-) cable first
and install it last.
"Loading the manual" means you need to wait until the file loads and becomes available for online reading. Some manuals are very large, and the time they take to appear depends on your internet speed.
Summary
INSTALLATION INSTRUCTIONS M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4 CHOOSING AN ADVANCE CURVE The function of the advance curve is to match the ignition timing to the burning rate of the fuel and spe...
INSTALLATION INSTRUCTIONS M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4 CENTRIFUGAL ADVANCE CURVE selecTIng The advance sPrIngs The rate, or how quick the advance comes in is determined by the type of springs whic...
INSTALLATION INSTRUCTIONS M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4 Figure 6 Changing the Advance Stop Bushing. selecTIng The advance sToP BushIng Three different advance stop bushings are supplied in the distributo...
