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• GM Small Block & Big Block V8, DUI & HEI racing coil kit • Designed for high revving engines that spin more than 7000 rpm's • Coil is capable of 10,000 rpm's which is almost twice the output of a stock HEI coil • Installed in brass terminal cap • Includes rotor & nylon rotor hold down screws • With the higher voltage output, spark plug gaps can be opened up to .055" • Kit fits on all GM V8, 6 cylinder & 4 cylinder distributors with the internal HEI coil • Caps are available in Black, Blue, Red