MSD 8489 Chevy Crab Cap Crank Trigger Distributor Installation - Manual

MSD Billet Crank Trigger Distributors
PN 8489 and PN 8486
Figure 1 Modified Block to Accept the O-Ring Seals.
NOTE: BLOCK MUST BE MODIFIED TO USE O-RINGS.
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Note: Read these instructions completely before attempting the installation.
Parts Included:
1 - MSD Distributor Assembly
2 - O-Rings
1 - Tube of Gear Lubricant
Replacement Parts:
Rotor, PN 8567
Rotor Base, PN 8568
Crab Cap, PN 8541
Standard Bronze Gear (0.500" ID), PN 8471
Oversize (0.006") Bronze Gear (0.500" ID), PN 8472
WARNING: During installation, disconnect the battery cables. When disconnecting the cables,
always remove the Negative cable first and install it last.
Note: A Crank Trigger must be used with this distributor.
An MSD Billet Hold-Down Clamp, PN 8110, is recommended.
O-RING SEALS
The MSD Billet Distributor features two O-ring
grooves in the bottom lands of the housing to
seal the oil gallery. These O-rings should only be
installed if the block has been modified as shown
in Figure 1.