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Most expensive corvette spark plugs..........

The AC 43N plugs were still doing fine in our old L78 Chevelle after 30K miles. Two boxes of eight cost all of $8 at a swap meet. I think a lot of this fancy spark plug stuff is nothing more than a con job. Different oils for every application imaginable. Same with antifreeze. People seem to eat this stuff up. There, now I feel better.
 

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