MSD 8474 HEI Distributor Kit Installation User Manual

Page 4

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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 • FA 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 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  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.

6.  Install the drive gear and roll-pin.

Note: If you want to lock out the vacuum advance, 

see page 7.

     

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

Blue 

21

Black-Largest 

18

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