Engine fail

oh wow small world lol. how does this happen?

The engine had been together since 1998 with lots hours on it (and it wasn't like they were really nice to it either).

With a 76mm piston, the aluminum around the sleeve is cut down pretty thin and the piston locked to the cylinder and split the cylinder clean in two. You can imagine that after they got done porting it to run like that there wasn't much sleeve left anyway....
 
is it a sleeve stuffed in a factory cylinder or is that cylinder piston a one time thing where would you get another piston if that happened just curious?