milPT,
I had my local hot rod garage install the plugs and they didn't seem to have a problem. I also just installed the Magnacor wires myself and they fit fine with the ZEX plugs. So I guess I'm at a loss. The name of the shop I use is Mathewsons in Renton, Washington. You might give them a call and I'm sure they would be glad to answer your questions. Just ask for Josh or Larry. their number is 425-226-2965.
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