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Hagerty
Hagerty Employee

My Model A engine used Blue Crowns, the spark plugs that powered Indy champions | Hagerty Media

The spark plug is commonly viewed as a disposable afterthought; only when they cause problems do we deign to think of these humble but hardworking pieces of porcelain and steel. The plugs I found in my recently revived Model A Ford were two-tone and marked with a brand name that I didn't immediately recognize-Blue Crown.
https://www.hagerty.com/media/automotive-history/my-model-a-used-blue-crowns-plugs-that-powered-indy...
1 REPLY 1
Hjbeard
New Driver

Blue Crown was not based in Chicago, the Zellar Corp which made the plugs was in Defiance OH. I know this because my father helped design the plugs and the machines that produced them