Installation Instruction Manual

Parts Included:

1 - HEI Rotor

The MSD GM HEI Rotor will install on stock GM HEI Distributors and the MSD Pro-Billet HEI

Distributor.

1. Remove the distributor cap. Remove the two screws on the side of the rotor and pull the rotor off.

2. Inspect the distributor advance mechanism, springs and weights for wear or damage.

Note: If the distributor has aftermarket weights and bushings, interference between the bottom of the

rotor and the bushing may result. To eliminate the chance of interference, remove approximately

1/10" to 1/8" of the bushing (Figure 1).

Figure 1 Modifying Aftermarket Weight Bushings.

3. For improved protection against spark arc-through, apply a small amount of MSD Spark Guard in

the rotor well area (Figure 2). This is not necessary, just added protection.

4. The Rotor will only install one way. Make sure the aligning slot lines up with the rotor plate mounting

tab (Figure 2). Tighten the screws and install the cap and wires.

MSD GM HEI Rotor

PN 8410

ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered

in our monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product

will help if there is ever a warranty issue with your product and helps the MSD R&D team create

new products that you ask for! Go to www.msdperformance.com/registration.

M S D • W W W . M S D P E R F O R M A N C E . 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

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MSD GM HEI Rotor PN 8410 ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered in our monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product will help if there is ever a warranty issue with your product and helps the MSD R&D team create new products that you ask for! Go to www.msdperformance.com/registration. Parts Included: 1 - HEI Rotor The MSD GM HEI Rotor will install on stock GM HEI Distributors and the MSD Pro-Billet HEI Distributor. 1.
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Figure 2 Installing the MSD HEI Rotor. Service In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty. When returning MSD components for warranty service, Proof of Purchase must be supplied for verification. After the warranty period has expired, repair service is based on a minimum and maximum fee. All returns must have a Return Material Authorization (RMA) number issued to them before being returned.