MSD Low Resistance HEI Bushing #8412 Brand_Grip on Neck diameter 7mm

Neck diameter 7mm

ASTM D4683-3

Offset 75mm

5/16 x 3/4 Set Screw 15 pcs 5/16 x 1 Set Screw 15 pcs 5/16 Hex nuts 45 pcs

Drill Chuck Capacity : 1/2"

MSD Low Resistance HEI Bushing #8412 Brand_Grip on Neck diameter 7mmThe carbon rotor button in a stock HEI distributor cap has very high resistance. When the high voltage of an MSD 6, 7, or 8 Series ignition is added, this resistance builds up heat and can actually melt the distributor cap. To solve this problem, install one of these MSD low resistance HEI bushings, which will pass the secondary voltage from the distributor cap to the rotor without the excessive heat buildup. HEI Bushing Carbon Button Low Resistance