I have an unmolested
’75 Royal Monaco, 400 CID,
46K. The sparkplug wires for
cylinders 5 through 8 seem different
than the front cylinders,
but I see no evidence that they
aren’t original. What’s going on?
Good eye! The rear four
cylinders, only, had silicone
jacketed plug wires, while the
front 4 were hypalon.
with Hypalon jackets, in 1962. A decade later, some
would be silicone rubber jacket, some not! See text.