by Roger Moffat – much more than just another WordPress weblog…
New and Old
AC Delco Professional 41-101 Iridium spark plugs. The old one on right has done 99,000 miles. The tip is worn down about .010″ if it was originally gapped at .060″ as the new one is. Interestingly, even though on the porcelain part it says AC Delco, on the metal body it indicates made in Japan by NGK
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