I recently replaced the original spark plug cables in our 83 at 155k mi. They still looked to be in good shape, but after 21 years I thought it was time. Absolutely no difference in performance/economy with the new wires installed, but hopefully they too will last a long time.
Son's 81 had been through a P.O. or two and had ratty looking cables and plug sockets...not Bougicord. I replaced them with some decent looking Bougicords from the pick 'n pull which cured a stumble when accelerating.
I'd say the Bougicords are good for 100k or so.
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and numerous old motorcycles)
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