is it possilbe to bore a 440 to a 600 or is a 500 the largest you can go?

likely going to have to be an entire top end.

so you saying id end up buying 600 jugs, heads, and pistons

so you saying id end up buying 600 jugs, heads, and pistons
[/b]
Sounds like a new top end ? ? ?

That still wouldn't be enough, You'd likely have to stroke the crank as well.