This "from NHRA.com" might explain this?
They romped through the first two rounds, but an error in setting the timing in the pits before the final was almost their undoing.
"We had a brain fart setting the mags, and they were x from being perfect; and we wanted to go one way, and they accidentally went the other way. When we fired it up in the finals, I could see on my dad's face that something was wrong. I was like, 'I better chop the Tree, because that's our only hope.' And I got a hold of it pretty good, and it was enough to win. I think it had three or four cylinders out downtrack because that thing was doing anything but going straight.