well yeah the water and antifreeze actually cool the engine but the radiator will help with cooling the liquid. but i'm also looking at the durability of the aluminum. would it last longer than a couple years. but then i didnt know they were made with plastic too. which thats not good, like you said would be tough to repair.

as for the engine block i though it was for both reasons cooler and lighter.

99 wrangler sport, auto. 2.5 inch lift, 31 MTR's