It is a 600cc. Mike seems to run only at Belgium in the Gr2 class. I don't know what that is, but he seems to be running "unscored". He is blindingly fast. I saw him race at Daytona in the 1980's.
If the big end went then the piston probably smashed the head enough times to pull the studs up and the crankcase bits would go with them. This happened to me at Road America in 2009, but it was a 500 and I caught it quickly. Still, at 90 mph the damage can happen very fast.
David