I'm with the general opinion. For a water block, KB is pretty much the gold standard.

I am a drag racer only any more. I've beat on the KB stuff to the limits of my smarts (not a great deal) in NA, nitrous, and mild blown stuff. They seem to take 1500 hp without getting out of shape. They will take another 500, but they start to show what they are at that point. Also much of any detonation above 1500 really puts it to them. Indy is far below those abilities. Not that they'll fly apart, just things move around more.

I've got a new KB coming, but I'm getting out of the cast stuff this winter, and going billet in my faster car.