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Original hemi plug wire sets had ceramic insulator ends almost
the length of the plug tubes through the valve covers into 1955. During
that year or certainly for the beginning of 1956, a switch was made from ceramic
to a pinkish orange phenolic wire insulator. Installation of the wire to
the plug is insured when these are in place. Standard ignition wire sets
without insulators can probably only be installed with a VERY LONG pair of
needle nose pliers. Currently available aftermarket plug wire sets that
are intended for hemis typically have some sort of silicone or quality rubber
insulators that approximate the original ceramic / phenolic.
Note that "exact" reproduction wire sets with "Mopar" inked
onto them to make them "genuine" are a sales gimmick. The factory wires
were inked with "Auto-Lite", a part number and a date code.
Wayne
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