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MOR 73673 Moroso 73673 Ultra 40 Spark Plug Wires Ford 351W Windsor HEI Male Boot Terminals Moroso Ultra 40 Unsleeved Plug Wire Set Small Block Ford 351W, 8.65mm Blue, HEI Ultra 40 un-sleeved wires are a cost effective version of the Ultra 40 Race Wire without heat sleeving. Wires feature a Kevlar core, four times stronger than other aramid fiber cores, that increases the tensile strength of the wire while reducing its center diameter. This allows for the surrounding insulation to be thicker, res...

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