1975 Article: Everything you've always wanted to know about spark plugs but were afraid to ask

How much do you know about spark plugs? How do they work and when should you change them? What type should you use and why? What can your plug's condition tell about your engine? The following pages will explain all you should know about spark plugs, their operation, their selection, and their use. And there's the most complete plug reading chart you've ever seen. Even if you weren't afraid to ask.

1975 Everything you've always wanted to know about spark plugs 12-Page Article available at www.DadsVintageAds.com

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