CK5
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good spark plugs???

I bought a set of Bosch +4's for my 350 and 2 were duds. My dad also had the same problem after buying these plugs. He had a dud. I'm gonna give AC Delcos a try when I put in the 396...
 
I had two bad autolites out of the box, (I swore them off at that point) and I've broken two delco's installing them.

Tells me that plugs are fragile, and I *suspect* that a fair share of "bad" plugs out of the box are due to harsh handling before they end up in our hands.
 
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