MSD
Pro Mag 20 Amp Generator, CW Rotation, Band Clamp
Part # 81502
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The 20 Amp generator is a favorite in alcohol slurping engines such Sportsman Dragsters and Quick-8 racers.
Pro Mag 20 Amp Generator, CW Rotation, Band Clamp
Estimated Ship Date: 06/30/2026
Free Shipping - Lower 48 US States
$2,999.95
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The increased output of the 20 Amp Pro-Mag was born of racers being racers; always asking for more power. This stemmed from drag racers that were using a 12 Amp system, but just didn't require a 44 Amp system. The engineers at MSD found that with a few changes to the internals of the generator it would deliver the increased current through the same Electronic Points Box, PN 8106.
There are three different generators available; a band clamp design in both CW and CCW rotation, plus a model built on a Chevy distributor base. All three require the PN 8106 Electronic Points Box. The band clamp versions are equipped with a large Ford style cap while the Chevy version uses a 4-inch cap and both are topped with heavy duty retainers.
| Brand | MSD |
|---|---|
| Category | Ignition |
| Emission Code | 4 |
| part type | Magneto |
| Sub Category | Distributor and Magneto |
| UPC | 085132815029 |
| Warning | California Proposition 65 |
| Part Number | 81502 |
![MSD Ford HEI Distributor Cap]()
The Ford-style cap has a provision for the coil wire to be routed in separately.$61.35Qty:![MSD Deutsch Connector - 4-Pin - 16-18 Gauge]()
Supplied with Terminals, Seals, and Housings$25.95Qty:![Dunn Style Cross Drive, Standard Length 0.900" for Band Clamp Pro Mags]()
CLEARANCE ITEM / ALL SALES FINAL - The replacement drive mechanism is supplied with a new locknut for installation.$95.25Qty:![Pro Mag Blue Rotor fits PN's 8130, 8140]()
Replacement rotor molded from DuPont Rynite.$41.62Qty:![Pro Mag Cap and Rotor, fits PN 8130, 8140]()
![Pro Mag Replacement Cap Ring fits PN's 8130, 8140]()
Replacement black ring for band clamp Pro-Mags.$118.95Qty:![]()
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This part is legal for sale or use on Racing Use Only Vehicles
The following vehicles are considered Racing Use Only Vehicles:
- Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street.
WARNING: It is against the law to install this part on an Emissions Controlled Vehicle
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Some parts are not legal for use in California or other states with similar regulations.