I use Evans coolant already, I kind of agree that the top portion of the cylinder needs the strenght so a 50% fill might not be as beneficial. as far as the cooling goes I dont worry about that much, I never had problems after I used Evans, alot of the heat in the lower end of the engine is absorbed by the oil wich inturns goes into the cooling system via the oil cooler.
Hard Blok water jacket filler
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too late boring done did. now punched out .020, originally the block was purchased new in 1997 and I put 120,000 until now, always had a fresh change of coolant for the first 4 years. Evans the remaining years.
yea I know new sleeves would be better but I think I can slide. I know the history of the block since new.
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