MSD Low-Resistance HEI Bushings 8412Brand: MSD Ignition Manufacturer's Part Number: 8412 Part Type: Distributor Replacement Parts Product Line: MSD Low Resistance HEI Bushings Automotive Fittings Part Number: MSD 8412 UPC: 085132084128 Distributor Replacement Part Type: Carbon button Quantity: Sold individually. Description: MSD low resistance HEI bushings prevent excessive heat buildup. The carbon rotor button in a stock HEI distributor cap has very high resistance. When the high
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Brand: MSD Ignition Manufacturer's Part Number: 8412 Part Type: Distributor Replacement Parts Product Line: MSD Low-Resistance HEI Bushings Automotive Fittings Part Number: MSD-8412 UPC: 085132084128 Distributor Replacement Part Type: Carbon button Quantity: Sold individually. Description: MSD low-resistance HEI bushings prevent excessive heat buildup. The 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.