How would you physically exceed "maximum rpms"? there is a fuel cut-out at 6750 (redline) which you cannot surpass unless you possibly tossed it in 3rd while going 115, or in 2nd while going 80, etc. Even then, the likely failure would be the clutch/TOB, and not the ENGINE.
What ACTUALLY happened (I say ACTUALLY because knowing what "ACTUALLY, ACTUALLY, REALLY, REALLY, TRULY, FOR REALLY REAL" (

)happened will help us narrow down possible culprits.