They didn't call him Grumpy for nuthin. I was in the pits at the US Nationals in Indy,,, about '74. Saw Grumpy sitting in the door of his car carrier with a carb in his lap. I could tell the wheels were turning about what he needed to do to that carb & just wanted to watch.
He reached behind him, grabbed a photo of his car, autographed it & handed it to me without looking up. I said no thanks & he just pitched it behind him, all while still studying the carb.
Not really grumpy, just intense with his job.