The other day I realized I forgot to drain my exhaust manifold when I put it away for the winter. Today I decide to uncover the boat to see how bad it is. I pull the drain on the manifold and probably a quart of water comes out. Should I assume it is cracked and buy a new one or start it up during the next warm spell here in Cny. The block was drained in October so should be fine, I hope. This is a 2.5 L