MSD 83921 Installation
MSD Dual Hall HVC Pro-Billet Distributor
Chevrolet - PN 83921, Ford 351W – PN 83922
SB Chrysler - PN 83923, Toyota - PN 83924,
Chevrolet R07 - PN 83925, Dodge - PN 83926
Parts Included:
1 - Distributor
1 - Wire Retainer
1 - Coil Wire Retainer
2 - Retainer Screws
1 - Gasket (Chevy Only)
2 - O-Rings (Chevy Only)
1 - O-Ring (Ford/Chrysler/Toyota Only)
Parts Required:
Distributor Gear
Harness Assembly, PN 8857
HVC Distributor Reluctor Removal
Tool, PN 83492
Note: The HVC Pro-Billet Distributor is NOT supplied with a gear. See page 2 for gears.
IMPORTANT
The MSD HVC Pro-Billet Distributors are the most advanced racing
distributors available. Take the time to read these instructions thoroughly
before installing the distributor. There are a variety of adjustments that
can be made to improve the performance of your engine and should be
understood prior to running the engine.
Use of a distributor spin machine (or equivalent), is recommended to
take full advantage of the HVC's adjustable features. With a degree
wheel and pointer, you will be able to easily and accurately set the
timing of the secondary pickup.
WIRING
These Distributors have four 2-wire Deutsch connectors that connect
to the ignition control.
2-PIN CONNECTORS
MALE CONNECTOR
BLACK Pin 1 Connect to a common ground.
RED Pin 2 12-volt input. Connect to switched 12 volts.
FEMALE CONNECTOR
BROWN Pin 1 Shielded Ground. Connect to Ground.
WHITE Pin 2 Trigger Wire. Connect to the points input
(White) wire of the MSD Ignition Control.
PICKUP ALIGNMENT AND ADJUSTMENTS
PRIMARY
NON-ADJUSTABLE
PICKUP
Figure 1 Separate Pickup Connectors.
SECONDARY
ADJUSTABLE
PICKUP
The HVC Pro-Billet Distributor features a primary and secondary pickup.
These are stacked together with the primary positioned on the bottom. The primary is fixed while the
secondary pickup is adjustable +/- 8°. The pickups are aligned at the factory at 0° advance/retard. The
position of the secondary pickup will need to be set to your specifications.
When installing the distributor there is an alignment indicator (Figure 3). By aligning the reluctor paddle with
the indicator, the timing will be within approximately +/- 3° of the desired amount. To adjust the secondary
pickup, loosen the two allen head screws on the top pickup. Next, turn the eccentric using an 11/32" wrench
to move the pickup (Figure 3). Secure the screws when the desired timing is reached.
M S D I G N I T I O N • w ww . ms di g ni ti o n. co m • ( 91 5) 8 57 -5 20 0 • F AX ( 91 5) 85 7- 3 34 4
2 INSTALLATION INSTRUCTIONS
RED
INDICATES CONNECTION
RED
TO
IGNITION
SWITCH
12VOLTS
AUTOMATIC COIL
SELECTOR
PN 8210
SPDT SWITCH
PN 8807
PRIMARY
GROUND
BROWN
TO TACH*
BROWN
TO TACH*
COIL
GROUND
ORANGE (+)
BLACK (-)
ORANGE (+)
BLACK (-)
HEAVY RED
TO BATTERY (+)
TO GROUND (-)
HEAVY BLACK
WHITE
TO REV CONTROL PN 8738
HEAVY RED
TO BATTERY (+)
TO GROUND (-)
HEAVY BLACK
WHITE
TO REV CONTROL PN 8738
COIL
BLACK
BLACK
* TO SWITCH TACH SIGNALS, MSD OFFERS A TACH SPLITTER, PN 8911.
SECONDARY
MAG PICKUP
(NOT USED)
MAG PICKUP
(NOT USED)
WHITE
BROWN
BROWN
RED
RED
WHITE
TO GROUND
PN 8857 HARNESS KIT
HVC PRO-BILLET
DISTRIBUTOR
Figure 2 Wiring a Complete Redundant System.
SERVICE
ADJUSTING
ECCENTRIC
MSD designed the HVC Pro-Billet Distributor to be completely
serviceable. Replacement parts are listed below.
SERVICE PARTS:
4 - Pin Deutsch Connector - PN 8181
Rotor - PN 8484
Extension Harness (set) - PN 8857
Reluctor Installation/Removal Tool - PN 83492
Finished Reluctor - PN 8349
Unfinished Reluctor - PN 83491
Pickup Assemblies
CW - Lower Chevrolet - PN 87571
CW - Upper Chevrolet - PN 87573
CCW - Lower Ford/Mopar/Toyota - PN 87572
CCW - Upper Ford/Mopar/Toyota - PN 87574
An unfinished reluctor, PN 83491 is available. This reluctor does not have
the individual cylinder paddles machined. Individual cylinder timing values
can be determined on the dyno using our electronic controls. These values
can then be machined into the reluctor.
SERVICE PROCEDURE
LOWER HOUSING
To replace the distributor bearings and seals, the lower housing must be disassembled. Both disassembly
and re-assembly require the lower housing to be heated for proper clearance. Review the following procedure
before starting the service. Figures 5 and 6 show exploded views of the five distributors available.
M S D I G N I T I O N • w ww . ms di g ni ti o n. co m • ( 91 5) 8 57 -5 20 0 • F AX ( 91 5) 85 7- 3 34 4
Bronze Gears
Chevrolet
Standard - PN 8471
+0.006" - PN 8472
+0.009" - PN 84722
+0.012" - PN 84723
+0.015" - PN 84724
Ford Windsor
Standard - PN 8585
Chrysler
Standard - PN 8525
+0.006" - PN 8526
Toyota
N/A: Contact TRD for
information
Figure 3 Adjusting the Secondary Pickup.
Figure 4 Unfinished
Reluctor, PN 83491.
SECONDARY
PICKUP
ALIGNMENT
INDICATOR
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