Spark Plug Wire Longetivy

I thought the Marti repro plug wires WERE high quality when I bought them. They look and fit fantastic, but sure am disappointed in how fast they degrade. Next time I fire up my Cougar, I need to look for sparks too because it has an occasional miss. Interesting lesson on spline rollers, Gary! Nice to hear there is still automotive parts manufacturing done in Detroit!

There must be an awful lot of force applied to create those splines! Never knew how it was done. Looks like a rough job you have…
Thanks!