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Mike51Merc · 10-03-2012, 02:36 PM

A sitting engine will always have some intake and exhaust valves open. The open valves let moisture in.

I wouldn't assume anything is cracked. Cracks happen for two main reasons: overheating and freezing water inside the jackets, you didn't have either of those things happen.

10-03-2012, 02:36 PM	#3
Mike51Merc Senior Member Join Date: May 2010 Location: Northeast Pennsylvania Posts: 1,582	Re: Flathead V/8 Question? A sitting engine will always have some intake and exhaust valves open. The open valves let moisture in. I wouldn't assume anything is cracked. Cracks happen for two main reasons: overheating and freezing water inside the jackets, you didn't have either of those things happen.