Re: Water in Oil 406 cu in
Agree, change head gaskets, most likely since all the cylinders look the same, as I read your post. If you suspect heads, have them checked for peace of mind.
The right amount of water in the combustion chamber, as you say, does make steam and loosens up the carbon. An old school trick in cleaning comb chambers, rev engine up and slowly pour in water, a small pour, otherwise, engine dies, and carbon is removed.
Alum heads should be torqued in place, use soft sealant on the head bolt threads, bring engine up to temp, break-in camshaft, if needed, check for leaks, set hot lash, then let engine cool overnight. Next day, retorque. A week later, retorque.
You could get by with manually running oil pump with a primer and a couple qts of oil, doesn't matter what kind or grade, and clean the journals and remove some of the oil from the hyd lifters. After engine is together, change oil & filter after 200-300 miles, or maybe the second/third drive, since not driven much, and compare the results.
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