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MSD Ignition 8225 - MSD Blaster Replacement Coils

MSD Ignition 8225 - MSD Blaster Replacement Coils

MSD Ignition#121-8225

GM HEI Distributor Coil
  • CARB E.O Number D-40-37
    • Fits Applications:
    • 1974-1989
    • Click to see All

    MSD Ignition 8225 - MSD Blaster Replacement Coils Details

    HEI Coil

    HEI owners now have a choice to replace their stock coil with the MSD High Energy Unitized Coil for GM HEI Distributors. The coil features special low induc­tance, high temperature windings which charge faster to give you increased spark energy at higher rpm. The premium epoxy filled construction is designed to withstand harsh race applications as well as the wear and tear that daily usage dishes out, and still deliver more spark energy to the spark plugs. The MSD Coil mounts in the stock HEI cap and installs in minutes. To receive the most from the coil, it is recommended to replace the module with MSD's powerful HEI Module, P/N 121-83647.

    Coil Specs:

  • Turns ratio: 70:1
  • Primary resistance: .31 OHMs
  • Secondary resistance: 9.2K OHMs
  • Inductance: 3.5 mH
  • Maximum voltage: 42,000 Volts (Tested with 6AL Ignition)
  • Peak current: 200 mA
  • Spark duration: 200 uS


  • 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 121-83647 Module)
  • 50 State Legal
  • CARB E.O Number D-40-37

  • MSD Ignition 8225 - MSD Blaster Replacement Coils

    Top off your GM, Ford, or Chrysler Ignition system with these great new replacement coils. Blaster Coils have MSD performance in factory style housings! MSD designed these coils by combining their Blaster Coil experience with E-core coil efficiency. The coils have a unique turn ratio, plus lower primary resistance than stock coils. This all amounts to a bolt-in replacement coil that produces more output voltage. These coils work with stock ignition and MSD-equipped vehicles.

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