Hard-Blok short fill
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Well I figure if you are pouring something into the coolant passages that surround the cylinder walls and hardens it has to add some strength to the cylinder walls for boost and Nitrous use and keeps them round. Also filling the block would have to make it alittle more sturdier and I would think help the mains from walking. Just my take on it cold be wrong though.
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It increases structural rigidity in the bottom webbing of the block and around the cylinders since it's basically concrete....
and from what i've heard it actually does a better job of keeping the coolant and oil seperated so oil temps might be even cooler than normal. (although I haven't experienced THAT). My oil typically runs in the 230-240 degree range after a pass....







