I'm in the process of tearing into my newly-rebuilt 188 in my 580B. Rebuilt last summer and ran great. Somehow, over the winter the thing froze, even with a full antifreeze mixture. Popped the water pump casting and the three freeze plugs in the top of the head. Already replaced those all, drained/refilled the oil and coolant (new oil filter, of course), and all was fine for about 10 minutes of idling. Great oil pressure, and purred like a kitten. Just wanted to warm it up at idle to get the rest of the milkshake/oil out and then refill with new oil. Anyway, oil and coolant levels were fine after 10 minutes, so I preceeded to let idle for 5 more minutes. Didn't check the oil and coolant levels again, I proceeded to just pull the oil drain plug and got out a gallon of coolant with the oil! So obviously after the thermostat opened, the coolant went into the oil. Needless to say I'm not happy.Tore into it yesterday. Freeze plugs in the head are still in place and ok, upper housing that the water pump bolts to is fine, and the cast aluminum coolant tube that goes from the water pump to the lower radiator is fine. There is coolant still in the block. With that upper water pump casting/housing off, there is a nipple that sticks down and has an o-ring on it. Coolant is still up to that level (near top of block). No more coolant has leaked into the oil pan since I initially drained it. The cylinder head is dry now. I am thinking that perhaps there was an air pocket in the cylinder head when I first started the engine, the thermostat opened after 10 minutes and put coolant up there, and maybe the head's cracked somewhere up there that will allow coolant into the oil.....somehow. Any ideas/thoughts would be appreciated. Are there any common points of cracking when these things freeze? Also, anyone know where I can buy a bare head or bare block if one or the other is busted? Thanks, Kevin
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