you'd be hard-pressed to find on a person on this forum who recommended anything made of aluminum, blocks in particular, Ply. just accept the fact that you don't know enough about water cooling; it's pretty obvious from your comments on Koolance and aluminum

I'm using an ancient Koolance NB block and it's absolute , no question about it. It will be replaced by a zalman passive radiator in a few days. there's a piece of Koolance for you.