MSD 8474 HEI Distributor Kit Installation - Manual (Page 7)

INSTALLATION INSTRUCTIONS 
M S D I G N I T I O N
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vacuuM advance lockouT
If you do not want to use the vacuum advance
canister of the MSD Distributor, MSD has supplied the
distributor with a lockout mechanism. The Lockout
assembly replaces the vacuum canister and will hold
the pickup assembly firmly in place. The installation
is easiest with the distributor out of the engine.
1. Remove the two Allen head screws that hold the
advance canister (Figure 12).
2. Remove the snap ring that holds the magnetic
pickup assembly in place. This is easy to do with
a set of snap ring pliers by straddling one of the
reluctor paddles.
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 13). 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 Lockout Hold Down Screw.
7. After checking the reluctor to pickup clearance,
tighten the Lockout retaining screws and install
the snap ring.
8. Install the distributor, rotor and cap. Check the
timing when complete.
Note: Do not forget to plug the original vacuum
advance hose.
Figure 13 Checking Installation of the Lockout Plate.
Figure 12 Removing the Vacuum Canister.
ReluctOR
paddles
canisteR
scRews
Mag pickup
plate
snap
Ring