sounds like u need to rebuild the engine for good measures... just take off the whole damn block and inspect everything, cause u dont want to like replace the valves and not see if theres any internal damage, like rods, crank, pistons, rings, etc. but yea i had that happened to me before, i was bumpin my subs hella loud on the freeway when i needed to pass this truck.. after almost passing it, i was at 4th at about 4k rpm (70 mph) and needed to shift to 5th, but with the music hella loud and my habits of slammin the clutch, gasssin it hard, shift, and let go of the clutch fast, i accidently hit 3rd. luckily my engine went to about 8500 rpm and i hit the clutch fast enough to save it. the clutch burned up hella bad