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MSD Ignition HEI Coil, for GM HEI distributors

HEI replacement coil offers increased spark energy when used with MSD HEI HEAT Module.

PART# 8225

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HEI owners now have a choice to replace their stock coil with the MSD High Energy Unitized Coil for GM HEI Distributors. This coil is a direct replacement of the stock coil and offers increased spark energy when used with the MSD HEI Module, PN 83647.


  • Direct performance replacement for GM HEI coil-in-cap distributors
  • 70:1 turns ratio and lower primary resistance produce high voltage output
  • Full power sparks to 9,000 RPM when used with 83647 MSD HEI Module
  • Recommended for use with MSD HEI Module PN 83647
  • CARB E.O. Approved


Emission Code1
Inductance3.5 mH
Maximum Voltage42,000 Volts
Peak Current200 mA
Primary Resistance.31 OHMs
Product TypeIgnition Coils
Secondary Resistance9.2K OHMs
Spark duration200 uS
Turns Ratio70:1
WarrantyLimited 1 Year Warranty
Part Number8225

Service Parts



This part is legal for sale and use on Emissions Controlled Vehicles, in all 50 states, when used in accordance with the manufacturers application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number.

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle

Tech Resources

Warranty Information

Limited 1 Year Warranty: See Details


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