It's funny, I never see any machine work being done in the pits when they run those 12,000 plus HP top fuel engines. I'm sure they may do a little.....mostly all I see are bearing and ring changes and the like. I guess they must not know the speed secrets of doing machine work on builds. You'd figure with the pounding those engines take, they'd want everything perfect, yet they run a lot of the same hard parts over and over. And win.