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Don't know, I was hoping somebody had seen it before and could tell us. The address is still Canonsburg, so that makes it pre-'75'ish??
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The ad was in Car and Driver, June 1974. Note it says Yenko Sportscars, not Yenko Chevrolet, or even Yenko Honda. The Chevy dealership was moved to McMurray by then, but Yenko still owned the Canonsburg building, using it for storage and at a time, as a Porsche/Audi dealership. Evidently they also continued to base "Yenko Sportscars Inc." from this location. I don't think they even had a Honda franchise until the early 80s...another interesting point to note is that it says "Transform YOUR Honda...", they were selling Stinger kits for Civics years before they were ever a Honda dealer. Pretty cool.