[A930Rocket]

I'm not familiar with the engine, but I'm guessing damaged pistons, bent valves, damaged valve guides, damaged/broken rocker arms and possibly damaged cylinders (from the pistons).

At least that's what I had when I downshifted from 4th to 1st (instead of 4th to 3rd) at 100 mph going into turn one at Road Atlanta. I barely got the clutch out, but the damage was done.