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This question comes up all of the time with boats here in Missouri. The rule we use here, that seems to be accurate is 24 degrees for 24 hours before water in the block will freeze. Last year I left a glass of water on the dock in freezing weather overnight (around 29 degrees) and it didn't have any ice in the glass. 24 degrees for a few hours is not going to freeze water in your engine. But if you are paranoid, like the others have said, drain the block.
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Kurt V
No more Porsches, but a revolving number of motorcycles.
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