Oh, no, sir. It's 12 and a half inches, regulation size. Now, it's been checked several times. You can check it if you like, sir.
9 seconds sound clip from the American Graffiti movie soundboard.
You can hear this line at 00:28:48 in the Blu-ray version of the movie.
Quote context
[...]
- You didn't happen to be around the corner of 12th and G about 8:30 tonight, did you?
- No. No, sir. We were at the movies, like I said.
- And the front end of this thing you're driving looks a little low.
[...]