Since 1952
America's Oldest Speed Shop ®
Speedway Motors Bill Smith

MSD 84022 Extreme HEI Coil Cover


Share by Email


Click image to enlarge




Q & A

What's in the Box

Replacement coil dust cover for MSD Extreme Output HEI Kit # 547-8502. Made from DuPont Rynite.

You may also be interested in:

HEI Advance Curve Kit
                        Modifies any GM HEI distributor with either clockwise or counterclockwise rotation and offers plenty of curve possibilities.  Center plate eliminates overcentering of centrifugal weights.  Comes complete with detailed instructions. 

NOTE: Installation of this kit may alter emission levels.

550-929 Instructions (PDF) 

HEI External Timing Adjustment Knob

This little jewel replaces the vacuum advance on an HEI distributor. This allows you to change the timing without having to loosen the distributor - just turn the knob.

Fits V8 engine HEI distributor only.

Seals-It FC-1001 French Distributor Clamp

"French" distributor clamps for Chevys provide superior clamping power and compensate for misalignment.

MSD Extreme HEI Rotor

Replacement rotor for MSD Extreme Output HEI Kit 547-8502. To handle the power and the larger coil of the Extreme HEI Ignition, MSD designed this special rotor made from DuPont Rynite.  

The Extreme cap and rotor will fit a stock HEI distributor, but must be used with an Extreme Output External Coil Adapter part # 547-84012 (sold separately).