It was accepted that it did stand for that for many years Charley.However that has been disproved.I found a note tucked in my seats that specifically said it stands for "Yellow Super Chevelle".It is still a mystery as to why the "Y" is biggerin the logo though.I assume it may have ben the same ad man that spelled Nickey Chevrolet with a backwards "K" .
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Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.