no worries, should be around 30 of not a tad more i the building and it would take an entire day or two for the water inside the block to freeze solid and cause damage. You had your boat "de-winterized"? as in water tested too? or just replaced all fluids, impeller etc, and got er ready for spring? If the engine hasnt been turned over yet you should still have anti freeze in the block anyhow. If not, i highly doubt any damage will be caused.
|