3306 top end noise

I was running the 973 building a lake when it started missing and had real low power. Took my ear muffs off and it has a real hard rattle in the top end. Slowly backed it out of the cut to get it out of the way and by the time I shut it off it was really banging and starting to blow out the dip stick. I'm guessing a piston came apart, it has no water in the oil so it's contained.

It started a weird vibration several weeks ago and we thought the harmonic balancer had slipped. I'm guessing...

3306 top end noise

3306 top end noise