Replacement coil dust cover for MSD Extreme Output HEI Kit # 547-8502. Made from DuPont Rynite.
Replacement coil for MSD Extreme Output HEI Ignition Kit # 547-8502. This coil can deliver more than 150 millijoules of energy. The Extreme cap and rotor will fit a stock HEI distributor, but must be used with the Extreme Output External Coil Adapter # 547-84012 (sold separately).
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. 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.Direct performance replacement for ...
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. 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. Direct performance replacement ...