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Pro Mag 20 Amp Generator, CW Rotation, Band Clamp

The 20 Amp generator is a favorite in alcohol slurping engines such Sportsman Dragsters and Quick-8 racers.

PART# 81502

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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.


BrandPro Mag
Emission Code4
Primary Current20 amps
Product TypeMagneto
Spark duration26° crankshaft rotation
Spark Energy240 millijoules (at the gap)
WarrantyLimited 1 Year Warranty
Part Number81502

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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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