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Coolant


I am getting ready to start my engine after a rebuild.
I am looking to fill up the heat exchanger and coolant system today. The engine is a 1983 crusader 454.
The book says "full system capacity" is 32 quarts for a 454, and 14 quarts of antifreeze. So about 44% ethylene glycol and 56% water.
Is 50/50 mixture good enough? I am in the boston area and definitely dont want any freezing issues.

Any additional advice is appreciated!

Thank you

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