The carbon rotor button in a stock HEI distributor cap has very high resistance. When the high voltage of an MSD 7-Series Ignition is added, this resistance builds up heat and can actually melt the distributor cap. The solution to this problem is the use of the MSD Low Resistance HEI Bushing which will pass the secondary voltage from the distributor cap to the rotor without excessive heat buildup.

More From This Category

MSD Distributor Wire Harness, Replacement 3-Pin, For Ready-To-Run Distributors

MSD Distributor Wire Harness, Replacement 3-Pin, For Ready-To-Run Distributors

$48.48

MSD Ignition Control Module, Ignition Controller, for PN [8366]

MSD Ignition Control Module, Ignition Controller, for PN [8366]

$283.52

MSD Camshaft Sync Pickup Kit, Replacement Hall Effect Pickup, with LED, Kit

MSD Camshaft Sync Pickup Kit, Replacement Hall Effect Pickup, with LED, Kit

$229.13

MSD Distributor Replacement Parts, GM HEI Distributor Lockout Kits, Advance Lockout Part Type, HEI, Kit

MSD Distributor Replacement Parts, GM HEI Distributor Lockout Kits, Advance Lockout Part Type, HEI, Kit

$63.94

MSD Tach Drive Adapter, Converts 3/16 in. to .104 in. Drive, Brass, Each

MSD Tach Drive Adapter, Converts 3/16 in. to .104 in. Drive, Brass, Each

$54.14