The wires are already factory assembled on both ends for the FORD 332, 352, 360, 390, 406, 427 & 428 ENGINES WITH THE FEMALE / NON-HEI (POINTS STYLE) DISTRIBUTOR CAP. Spiral core is the best of both worlds because it gives you high performance without any interference on your radio and electronics.These spiral core wires produce higher performance through improved efficiency, quicker throttle response, and reduced emissions.
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