MSD HEI Ignition Coil H777C08 Allows for one 2-1/2" ID

Allows for one 2-1/2" ID coil over spring to be stacked on top of another without shifting or moving from side to side

1971-1971 Mercury Cyclone

Will not fit Boss 351

you can replace just the "Nose Only Graphics"

1977-1978 Dodge Diplomat

MSD HEI Ignition Coil H777C08 Allows for one 2-1/2" IDHEI 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 83645. 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