valve seats came out on my 9,000 motor

What causes valve seats to fall out? Fuel choice? Motor and head only had 9,000 miles. Now I have 2 smashed pistons and a screwed up head. What can I do to prevent it again? Is it fuel related?

what head?did you have new seats put in them or what?more info.sorry bout the bad luck.

im my daily driver 2.4 cavalier. aluminum head. got the head from cylinder head international in texas. 4 valves per cyclinder and all 3 where on its way out and one in my piston. another cylinder starting to come out also.

mods can this be moved to general disccusion?

My guess would be improper installation of the seats. Fuel choice should not have anything to do with them coming out. I've seen all sorts of stuff used for fuel( diesel/gas blends, kerosene/gas blends, etc.), and not hurt a valve seat.