Showing results for 
Search instead for 
Did you mean: 
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.
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