With at least some part numbers, NGK is the supplier to ACDelco. The plugs in my Trailblazer (Iridiums) are made by NGK but packaged and labeled as ACD. I've heard that ACD does not "make" spark plugs any more, and hasn't "made" plugs for years--maybe decade(s).
So far as I know, ACDelco does not "make" ANYTHING. They're a sales organization, every part number they sell is sourced from someone else, then put into an ACDelco box.
Champion had the most-brittle porcelains in the industry when I quit using them near 40 years ago. Soft, fast-wearing electrodes, too.
I used to like Autolite, but then they moved production to China for at least some part numbers.
So far as I know, ACDelco does not "make" ANYTHING. They're a sales organization, every part number they sell is sourced from someone else, then put into an ACDelco box.
Champion had the most-brittle porcelains in the industry when I quit using them near 40 years ago. Soft, fast-wearing electrodes, too.
I used to like Autolite, but then they moved production to China for at least some part numbers.
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