swimming pool motors

I've scrapped three, all from commercial pools and hot tubs, the windings in all three were copper. The last one was an A.O. Smith 2hp bolted to a hayward super pump II, fair amount of work to break it down , but worth it to me.

I snipped through the windings on a couple I was breaking down and it appeared to have alu. look in the center all though the guage of the wire is pretty small. Does it make any difference if the motor is an above ground motor or not? I do have a couple of the larger 2 horse motors. Also does the pressed in bearing or coated bearing keep you from receiving the cast alu price on the end caps?