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

FAST XR3000 Points Replacement System for 1974 to 1983 Import Engines

FAST XR3000 Points Replacement System for 1974 to 1983 Import Engines

$311.48

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 Vacuum Advance Mechanism, Replacement, for Distributor, Each

MSD Vacuum Advance Mechanism, Replacement, for Distributor, Each

$76.73

FAST Vacuum Advance Canister

FAST Vacuum Advance Canister

$25.51